Australia’s Time Zone Corners

On April 24, 2016 · 2 Comments

Twelve Mile Circle loves mail! I’ve discovered all sorts of interesting geographic artifacts from readers who’ve sent a much appreciated note. This time a message arrived from reader "Jonathan" who has offered several suggestions in the past. He mentioned a place he noticed while looking at maps of Australia. It was called Cameron Corner, found at the intersection of New South Wales, Queensland and South Australia. This wasn’t just any ordinary tripoint, it also marked a separation between three Time Zones during periods of Daylight Saving Time – DST. I later saw that this happened at two other Australian tripoints. The concept definitely piqued my curiosity.

Cameron Corner


Untitled
The Corner Store, Cameron Corner by bushie on Flickr (cc)

The specific situation that existed at Cameron Corner meant that anyone within the vicinity would have an unusual opportunity to celebrate New Years three times in a single evening. It sort-of reminded me of the instance of being able to celebrate one’s birthday twice. During DST, New South Wales followed UTC+11 (i.e., eleven hours beyond Coordinated Universal Time, abbreviated UTC for some odd reason). South Australia followed UTC+10:30 during DST. Queensland didn’t recognize DST at all so it remained at UTC+10 all year long. A post marked the actual tripoint where this rare condition occurred.

People actually lived at Cameron Corner in the middle of nowhere, albeit with a very small permanent population of two souls who operated the Cameron Corner Store. I found more information about this obscure crossroads than I would have imagined given its remoteness. Little of this came from my usual sources. I found another source that was great though, TripAdvisor, of all places. A fair number of people went out of their way to stop at Cameron Corner and some of them recorded their experiences in rich detail. The store included a restaurant, a small hotel, a campground, a petrol station, and a pub where it seemed like visitors made a point of drinking into the early hours of the morning. There wasn’t much else to do so far into the Outback. The site also had a 3-hole desert golf course where a round included a hole in each state.

There were a number of TripAdvisor quotes that interested me, including a very simple description of Cameron Corner, "a metal post, a pub and a fence." That seemed straight and to the point.

Another reviewer noted,

There is only one shop/store on the Queensland side although their postcode is in NSW and telephone number is SA. As each state has a different time zone, they are known to have three New Year’s each year. I was told by Fenn, the shop-keeper that last year, they had about 70 guests passing this area for New Year’s and that they walked from one state to the other to celebrate the different times (which are only metres away from each other).

And finally

The corner itself, of course, is nothing but the marker post, the dingo fence and the Corner Store and the feeling of being remote is oh-so palpable when you arrive there and step out of your vehicle; the silence is absolute. Just magic!… This is not a trip to be undertaken lightly, though; on the trip in on the unsealed road we saw no other traffic – 280km – and only one car on the way out; spare water and fuel for the "just in case" moments are a must

This prompted me to look at some of the other Australian corners. Cameron Corner was the most accessible by far.


AUS locator map with corners full
AUS locator map with corners full on Wikimedia Commons (cc)

Poeppel Corner and Surveyor Generals Corner exhibited the same phenomenon, with a three state, three time zone anomaly during DST. MacCabe Corner and Haddon Corner did not, and Haddon Corner wasn’t even a tripoint. I decided to examine the first two a little more closely.


Poeppel Corner


Poeppel Corner
Poeppel Corner by
John Benwell on Flickr (cc)

The Northern Territory, Queensland and South Australia all met at the Poeppel Corner tripoint. Unlike Cameron Corner, nobody lived there and scant information existed. The Australian National Placenames Survey included a nice newsletter article though (pdf format). The corner was set deep within the Simpson Desert, accessible only by 4-wheel drive vehicles, and registered perhaps 2,000 visitors per year:

In 1880, Augustus Poeppel, South Australian Government Surveyor, marked the corner with a coolibah Eucalyptus microtheca post, 2.1 metres long by 0.25 metres in diameter. The post was dragged 58 miles (92 kilometres) westward from the Mulligan River. Poeppel adzed it on three sides and chiseled into it the words "South Australia, Northern Territory and Queensland"… Poeppel returned to the corner in 1883 to commence the survey of the Queensland/Northern Territory border. The post was not seen again by a European until 1936

The nearest people today are probably found in tiny Birdsville, more than a 150 kilometres (93 miles) away. One would need to be amazingly dedicated to go all the way to Poeppel Corner to experience this single post in the ground.


Surveyor Generals Corner


Surveyor Generals Corner Visit from Alan McCall on Vimeo.

More difficult yet would be a journey to Surveyor Generals Corner, the tripoint of the Northern Territory, South Australia and Western Australia. It contained an interesting geo-oddity though, a surveying error.

So in 1968 two monuments were set up at the resulting right-angles where the WA border does a brief east-west zig-zag in the desert. The easternmost corner, where two states and a territory meet, was named Surveyor-Generals Corner after the three officials who attended the ceremony.

Two cultures crossed at Surveyor Generals Corner. People of European descent created Australian States with straight lines that formed an arbitrary tripoint. The original Aboriginal people considered the spot their own, and had occupied it for millennia. Thus, anyone who wanted to experience Surveyor Generals Corner in person required explicit permission and a guide, in addition to the usual Great Central Road permit. That could be arranged by contacting the Wingellina (Irrunytju) Community Office in the Shire of Ngaanyatjarraku, Western Australia. The logistics were discussed in ExplorOz.com

The corner consists of two actual markers separated by a distance of 75 metres. This creates a dogleg in the WA border. It is approximately seven km north east of Irrunytju community. Both are on the land of Mr Eddy and you must be escorted to the markers by one of the traditional owners. Arrangements (permits) have to be obtained prior to heading to Irrunytju (Wingellina) thru the West Australian DIA website. Prior to heading that way, ring the store or community centre to ensure that people will be around and available at the time of your arrival. Once arrived at Wingellina, head to the community centre and pay the appropriate fee (At July 07 – it was $100 per vehicle and $20 per person) and someone will be located to escort you (usually Mr Eddy or Mr Donald Ferguson, both community elders). Both are very helpful and will give you permission to take photographs.

I’ve not been to Australia in awhile. However, if I’m ever lucky enough to return, I would love to push away from the coast and visit one of these tripoints. Have any of the Australian 12MC readers ever been fortunate enough to experience these places in person?


Unrelated, but not completely unrelated

In preparing this article I went back through the index and I noticed I’d posted several other Oz-centric articles over the years. Enjoy.

Naviduct

On February 7, 2016 · 2 Comments

Twelve Mile Circle decided to stick with the aqueduct theme once again after the recent discussion of England’s Barton Swing Aqueduct. There were other structures, equally fascinating in their own distinct ways. Some were large, some were unusual, and some offered elements of both. Many of those innovative structures seemed to concentrate in western Europe, an obvious leader in navigable inland waterways.

Longest Navigable Aqueduct


Magdeburg Water Bridge seen from a kite
Magdeburg Water Bridge seen from a kite by Pierre Lesage on Flickr (cc)

Aqueducts designed simply to move water were interesting by themselves, however I was considerably more fascinating by those designed to carry boat traffic above the surrounding terrain, akin to a bridge for boats for a lack of better words. For more than a century the title of longest navigable aqueduct had been held by the Briare aqueduct of the Canal latéral à la Loire, the canal over the Loire River in France (map). It was a magnificent masonry structure with a steel trough stretching 662 metres (0.4 miles). Then came Germany’s Kanalbrücke Magdeburg, or Magdeburg Water Bridge in 2003 (map), considerably longer at 918 metres (0.6 miles) albeit more utilitarian than beautiful.

Upon it’s opening, the German broadcaster Deutsche Welle proclaimed,

In what’s being hailed as an engineering masterpiece, two important German shipping canals have been joined by a giant kilometer-long concrete bathtub… The water bridge will enable river barges to avoid a lengthy and sometimes unreliable passage along the Elbe. Shipping can often come to a halt on the stretch if the river’s water mark falls to unacceptably low levels.

The Magdeburg Water Bridge provided a vital direct connection between two separate canals on either side of the River Elbe, the Mittellandkanal and the Elbe-Havel, essentially connecting eastern and western Germany directly by water as well as to nations beyond its borders from Poland to France and the Benelux region. The possibility had been envisioned at the turn of the last century when construction first began. Two World Wars and the politics of a protracted Cold War completely halted the dream. German reunification provided an impetus to renew and complete this effort, nearly a century after initial construction first began. Now it’s a reality.


Largest Lock



Zandvlietsluis & Berendrechtsluis; Antwerp, Belgium

Belgium’s Port of Antwerp locked-up (pun alert) the title for the world’s largest canal lock. It handled 200 million tonnes of cargo in 2015, enough to make Antwerp one of the Top 20 busiest ports in the world, and it "aims to keep growing," Locks were necessary to protect the port from strong tidal actions pushing in and out along the Scheldt River. The locks kept water levels constant on the port side of the structures. Oceangoing cargo container ships kept growing larger so the locks had to follow suit in a continual game of catch-up. They became truly mammoth.

Antwerp first claimed the largest lock title with the construction of the Zandvlietsluis, or Zandvliet Lock, in 1967. That remained sufficient for a solid three decades until a new class of larger ships threatened to diminish the port’s usefulness. The port authority responded by opening a new lock parallel to the Zandvlietsluis in 1989, the Berendrechtsluis, or Berendrecht Lock. It was great enough to accommodate Post Panamax container ships (Panamax being an official set of dimensions for the largest ships that can navigate the Panama Canal). The Berendrecht Lock, currently the largest lock in the world, is 68 metres (223 ft) wide, about 11 metres (36 ft) wider than the Zandvliet Lock.

Right on schedule, however, container ships grew once again to an even larger behemoth class called New Panamax. Elsewhere in the Port of Antwerp, engineers are building the Deurganckdoksluis, or the Deurganckdok Lock. It will encompass the same length and width as Berendrecht, and in addition it will be four metres deeper to accommodate the extra draft of New Panamax ships. The Deurganckdok Lock was undergoing testing at the time I posted this article and was expected to open in April 2016.


The Naviduct



Obviously Twelve Mile Circle fixated on superlatives like the world’s longest navigable aqueduct and the world’s largest lock, although the real reason for this article centered on a combination of the two: the worlds longest/largest aqueduct with a built-in lock. Actually there was but a single example of such an unusual structure currently, the Netherlands’ Naviduct. The concept was so new that the term stood on its own. THE Naviduct.



Naviduct on Houtribdijk

The whole situation seemed odd. The Netherlands was renowned for land reclamation and that figured indirectly into the creation of the Naviduct. The nation planned to drain a 410 km2 (158 mi2) polder — about the size of the Caribbean island of Barbados — to be called Markerwaard. It went so far as to create a 27 km (17 mi) dike between Enkhuizen and Lelystad that it completed in 1975 and called the Houtribdijk, resulting in two large lakes, Markermeer and IJsselmeer. However the project stalled and the Netherlands abandoned its plan altogether a couple of decades later. Nonetheless the nation still had a long dike which, by that time, carried the new N302 Motorway that separated two large lakes. Authorities also built a lock between the two lakes, a necessary step because prevailing winds affected the lakes differently even though they were at the same elevation. However ships and cars couldn’t cross the point at the same time. It created a transportation mess.

Thus, Dutch officials faces simultaneous dilemmas of their own creation: a problematic connection between two bodies of water; and a transportation bottleneck impacting maritime and automotive traffic. They responded by designing an aqueduct with a lock built within it, the Naviduct. Motorway traffic flowed below the aqueduct while ships sailed across it. I don’t know why they didn’t simply build either a tunnel or a bridge for the motorway. Regardless, their preferred solution was infinitely more interesting and it went into service in 2003. The structure remains the only Naviduct for the time being although it has been considered as a possible solution for other locations in the Netherlands. It would be hard to imagine its usefulness elsewhere since few other places face the same set of extreme geographic challenges. We should simply enjoy its existence.

Select African Superlatives

On January 27, 2016 · 0 Comments

I thought I’d lump another set of somewhat related items together as I continued to cull the enormous backlog of possible Twelve Mile Circle topics. They didn’t have much in common except that they all involved continental Africa. Two were geographical observations and two were geological oddities. All of them piqued my interest although not enough to devote an entire article to them.

Long Flights



Most of us have probably seen the recent comparison-style maps on the Intertubes lately, some demonstrating Africa’s immense size. Brilliant Maps, for example, had a wonderful portrayal of the True Size of Africa in an article a few months ago. People tended to misconstrue Africa’s enormity, probably due to its under-representation in popular media combined with Mercator map projections that distorted its actual size. Twelve Mile Circle fell into some of those same traps as witnessed by the relatively few African article markers on the Complete Index page.

In that vein, I pondered Africa’s enormity in a slightly different manner using great-circle distances. And what better measure of great-circle distance could I generate than airline flights? One could take a direct nonstop flight from Lagos, Nigeria to Nairobi, Kenya (currently 7 flights per week on Kenya Airlines) and ponder its width. That would carry a traveler from west to east across the continent, not even its widest part, and it would take 5 hours and 20 minutes. That compared pretty nicely with a flight from New York to San Francisco across the width of the United States; or from London, England to Ankara, Turkey.

Looking at length, one could then take a nonstop flight from O. R. Tambo International Airport in Johannesburg, South Africa to Cairo, Egypt (4 flights per week on EgyptAir) in 8 hours, or alternately to Dakar, Senegal (3 flights per week on South African Airways) in 8.5 hours. That compared rather favorably with a flight between Chicago, Illinois and Paris, France. Of course, an entire ocean didn’t have to be crossed on any of those African flights. That, to me, demonstrated its vast expanse quite succinctly.

Plus, now I get to see all sorts of interesting advertisements on my website now that Big Data thinks I’m contemplating so many far-flung adventures.


Extreme Elevation (or Lack Thereof)


Gambie
Gambie by Guillaume Colin & Pauline Penot on Flickr (cc)

Africa demonstrated many extremes, although not in every instance. Certainly a landmass of its size featured an array of elevations, from Mount Kilimanjaro in Tanzania (5,895 metres / 19,341 feet) down to Lake Assal in Djibouti (-153 m / -502 ft). I wondered though, which African nation had the smallest elevation extremes. I discounted the various offshore islands that were considered part of Africa and focused on the continent itself. The honor went to The Gambia. I featured Unusual Geography of the Republic of The Gambia in the very early days of 12MC and even commented on its elevation. What I didn’t note at the time was that its greatest "peak" (53 m / 174 f) was also the lowest national highpoint on the continent.

The website Peakbagger included this highpoint in its database, a place called Red Rock (map). Only one Peakbagger member claimed to have conquered its summit. I wasn’t surprised.


Weird Volcano



The continent also served as a home for what National Geographic dubbed the Strangest Volcano on Earth. The Ol Doinyo Lengai stratovolcano in the Gregory Rift of the larger East African Rift of Tanzania (map) was well known to vulcanologists for its unique properties. It was the only active volcano that was known to produce natrocarbonatite lava. The lava at Ol Doinyo Lengai wasn’t based on silica as was typical, rather it was composed of sodium and potassium carbonate minerals.

…the temperatures of these lavas are much lower, "only" about 600 deg. C., and Lengai’s lava does not emit enough light to glow during day,- only at night, a dull reddish glow that does not illuminate anything is visible. Also because of its peculiar chemical composition, the lava is extremely fluid and behaves very much like water, with the exception that it is black like oil. After it is cooled down it quickly alters and becomes a whitish powder.

Black water lava? I’d love to see some of that in person. I may have to settle for the YouTube video for now.


Large Crater


Map of Vredefort dome
Map of Vredefort dome via Wikimedia Commons

In the distant ancient history of the planet, something like two billion years ago, an asteroid slammed into the earth leaving an impact crater 300 kilometres (185 miles) across. The asteroid was much smaller than that, maybe 5-10 km in diameter, although it hit with such tremendous speed and force that it vaporized stone for great distances in all directions. This celestial divot was called the Vredefort crater — named for the South African settlement that grew there in modern times — the largest verified crater on the planet.



Very few signs remained because of its ancient pedigree, leaving it mostly eroded. A structure known as the Vredefort Dome sprouted at impact, an uplifting of rock that occurred at the very center of the strike. It was mostly weathered away too although it still appeared as a faint semi-circle on satellite images. A few roads also crossed its ridges, making it an interesting sight in Google Street View (image).

The thought of an impact that large seemed terrifying.

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12 Mile Circle:
An Appreciation of Unusual Places
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