Figure 1. Principal physiographic features of the eastern Arctic sector. Numerals denote: Basins (1-4): 1 - Podvodnikov, 2 - Makarov, 3 - Stefansson, and 4 - Chukchi. Rises (5-6): 5 - Chukchi Plateau, Northwind Ridge. Topographic base, [International..., 2002], (http://www.ngdc.noaa.gov/mgg/bathymetry/arctic/arctic.html)