Bykovskiy Peninsula – protrudes into the Laptev Sea from the mainland shore to the southeast of the Lena mouth. Its form is an acute triangle. The main massif of the peninsula lies in parallel to the shore and joins with it in its southwestern part with the help of a narrow Kolychev land bridge. The peninsula is about 41 km long and in some places 35 m high. It is formed by frozen marine depositions and is actively eroded from the eastern side. It presents a hilly tundra. To the south of the peninsula there lies Tiksi Bay and to the west Neelova Bay.