Siphonia:
Mornington Sea

by Chris Wayan, 2006

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Map of the Mornington Sea region of Siphonia, a study of the Earth with 90% of its water drained away.

Mornington Sea and Scotia Basin: overview

Perhaps these should have separate pages: Scotia Basin, while only two million square kilometers, is a spectacular region and geologically hyperactive; Mornington is huge, fertile, but gentle.

Mornington Sea

Most of Siphonia's seas lie about 4 km (13,000') below the sea levels of old Earth. The Pacific Basin is the largest exception: its two main seas, the Pacific (old North Pacific) and Agassiz (south-central Pacific) are fully five km down (about 16,500'), with denser air and hotter climates. Mornington Sea, in the southeast, is an exception to the exception: the largest sea in the Pacific Basin that's only 4 km down, same as the Atlantic or African Oceans. That's still enough to warm up its climate substantially; for a sea practically licking the toes of Antarctica's glaciers, it's very mild. This mix of high latitude and low altitude leaves the basin with quite Earthlike temperatures--unlike the steamy Agassiz or Pacific. Rainfall ranges from moderate to heavy; in this region, the green on the altitude maps matches the reality on the ground: its long coasts are all solidly wooded, though the forest is arctic and thins quickly on the south shore. Think Alabama at the north end, grading slowly to Newfoundland on the south. The western shore, Menardia, is steeper, rising slowly to a winding ridge 2-3 kilometers high, broken by long deep cliffwalled valleys--fracture zones. South of the Menard zone itself lies Eltanin, with long Lake Heezen in its depths, then a twin, Tharp Valley, over a ridge to the south. A few hundred km further south is Udintsev Fracture, also with a long lake. These long cliffwalled sounds and lakes resemble fjords but are carved not by ice but by fire: the ridge is a spreading rift zone, and as it bends, cracks grow out at right angles to the rift, like cracks in a carrot that grew too fast.

The flora here may be familiar, but not the fauna. Air pressure isn't as high as in the other Pacific basins, but it's still over 50% denser than our sea level--high enough to encourage gigantism and flight in animals. In the north, megaparrots are probably the most common people, giving way to equally huge ravens in the south; giant otters are common in every port. Humans are common all round the Mornington, but the only other apes are orangutans, in the north; chimps, bonobos and gorillas haven't yet made it around the icy stratospheric wall of the Andes. Map of the Scotia Basin south of Patagonia, on Siphonia, a study of the Earth with 90% of its water drained away.

Scotia Basin

This geologically tormented region is like nothing on Earth. Except itself, I mean--hidden, in our world, under 2-3 miles of brine. Exposed, it's a basin hard to sum up in a paragraph or two.

A horseshoe of mountains surrounds it: the Grahams and Scotias in the south, the Sandwiches in the east, and the Yaghans and Georgias in the north, where Mt Paget rises nearly 7000 m (23,000') high. Even in the north, peaks much above 3 km (10,000') are icecapped, especially on south-facing slopes, and in the south, on the edge of Antarctica, some glaciers creep as low as a kilometer.

Yet the basin's climate is mild for its latitude: air pressure is 1.5 atmospheres, trapping heat. Winter snows are not severe, and summers can be warm.

A maze of narrow sounds wind through the northern half of the basin, paralleled in the south by a set of freshwater lakes. The largest, Lake Shetland, is nearly 1000 km long, as big and deep as our Lake Baikal. Conifer forests hug the lakes and sounds, fraying to alpine meadows on the heights. It's vaguely Scandinavian, but with milder winters, due to the dense air.

Here too, populations are mixed: mega-ravens, giant otters, and humans on the coasts, thinning to a purer human population in the hills.

Map of Siphonia, a world-building experiment. Click a feature to go there.
TOURS

The following route snakes around Siphonia, covering most features (under construction)

  1. Arctic Valleys, sea level to 3 km high
  2. Atlantic Ocean (our N. and S.E. Atlantic), sea level
  3. African Ocean (S. Atlantic plus W Indian Ocean), sea level
  4. Bengal Sea (N. Indian Ocean), sea level
  5. Australian Ocean (E. Indian Ocean, Tasman Sea), sea level
  6. Davis Sea (S. Indian Ocean), sea level
  7. Anzac Basins (N.Z. to Australia), 0.5-2.5 km high
  8. Mornington Sea (S.E. Pacific) sea level
  9. Nazca Seas (E. Pacific), sea level to 1 km high
  10. Agassiz Basin (S. Pacific), 1 km down
  11. Pacific Ocean (central & N. Pacific), 1 km down
  12. East Asian Seas, 1-3.5 km high
  13. Javan Seas, 0.5-2.5 km high
  14. Australia, 4-5 km high
  15. Amazon Highlands and Andean Cap, 4-8 km high
  16. African Highlands, 5-6 km high
  17. Antarctic Cap, 4-5 km high (no, not 7-8!)
  18. European and Siberian Highlands, 4-6 km high
  19. Caribbean Lakes, 2-5 km high
  20. Canadian Highlands, 4-6 km high
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