Byrd Glacier seabed topography, Antarctica. Topography of the seabed and land in the area of the Byrd glacier, Antarctica. Elevation is colour-coded from maximum depths (dark blue) to highest elevations (red/brown). The Byrd Glacier is about 136 kilometres long and 24 kilometres wide, flowing eastward to discharge into the Ross Ice Shelf. The valley (dark blue) below the glacier is 2780 metres below sea level. This image was created by the Antarctic BedMachine mapping project. BedMachine uses satellite data on ice flow motion to estimate what lies between ice thickness radar soundings. Understanding the underlying topography helps predict rates of ice loss and sea level rise associated with climate change.