The headwaters of the Onyx River are near the ocean and the river flows away from the ocean. This rather unusual behavior is a result of how the Dry Valleys were formed. At one time the Ross Ice shelf was thousands of feet thicker than it is today and the ice flowed off from it towards the Polar Plateau, carving the Dry Valleys. Now that Ice Shelf has decreased in size, the ice has retreated from the valleys and the Polar Plateau is higher than the valleys and the current ice shelf (now at sea level). The glaciers now spill off the Polar Plateau in the opposite direction from which the valleys were formed.
Dry Valleys and Fata Morgana March 11th 2005 Here are some more photos I took from a helicopter while flying through Taylor and Wright Valleys last month. Both valleys are part of the McMurdo Dry Valleys, one of the largest snow-free areas in Antarctica and an area of intense scientific interest and investigation. All these photos were taken through the plastic windshield of the helicopter, so they are not the best quality.
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Antarctica » Antarctica » McMurdo Station Speculation over the existence of a "southern land" was not confirmed until the early 1820s when British and American commercial operators and British and Russian national expeditions began exploring the Antarctic Peninsula region and other areas sou... ... read more