Marie Byrd Land
is a large unclaimed area in remote West Antarctica, and the Whillans Ice Stream is a river of ice that pours from the (http://www.ibtimes.com/west-antarctica-glacier-ice-sheet-history-over-11000-years-larsen-c-ice-shelf-poised-2561918) West Antarctic Ice Sheet into the Ross Ice Shelf.
Those areas depicted in blue lie below sea level, including the Bentley Subglacial Trench, a vast chasm in Marie Byrd Land
that at its lowest point is more than 2,500 metres below sea level.
He has successfully negotiated some of the most difficult international routes including the north side of Everest, the north face of Kangchenjunga in Eastern Nepal (the world's third highest mountain), Mount Kenya, Mount Aconcaqua in Argentina as well as the Ross Sea and Marie Byrd Land
In the 1930s the US briefly made a claim to the unclaimed territory (Admiral Byrd named it Marie Byrd Land
after his wife) but the US did not persist with it because it said that it disapproved of such claims.