The western part of Kotelny Island proper, also known as Kettle Island, is the largest section of the group, with an area of 11,665 km². It is rocky and hilly, rising to 374 m on Mt. Malakatyn-Tas. The Chukochya River flows westwards to the Laptev Sea. Cape Anisy is the northernmost headland of Kotelny and it is an important geographical point for it marks the NE limit of the Laptev Sea. Cape Medvezhiyis the southernmost headland of the island.