The total catchment area is 1,342,000 km2. Among the rivers flowing into the East Siberian Sea, the Indigirka, Alazeya, Chukochya, Kolyma, Rauchua, Chaun, and Pegtymel are the most important. Only a few rivers are navigable. The coastline of the sea is 3,016 km long. It makes large bends, sometimes stretching deep into the land, and has a rather different topography in the eastern and western parts. Fine bends are rare and occur only in the river deltas. The coastal section between the New Siberian Islands and the mouth of the Kolyma River is uniform, with low and slowly varying slopes. It extends landwards to the marshy tundra filled with numerous small lakes. In contrast, the coast to the east of the Kolyma River is mountainous, with steep cliffs.