Antarctic ice sheet
The Recovery Ice Stream that drains part of the East Antarctic Ice Sheet into the glacier is nearly long and feeds the Filchner Ice Shelf over the Weddell Sea. The area contains four subglacial lakes, causing the ice flow rate to vary dramatically, ranging between 2 and 50 meters per year. The ice stream drains about 35 billion tons of water and ice into the ocean each year, while the entire East Antarctic ice sheet releases about 57 billion tons a year.