The total area of the reserve is 1,433 thousand hectares, including: tundra — 585,254 hectares, tundra-marsh — 173,313, water — 603,883, other (sands) — 70,550 hectares. The territory of the reserve is part of the tundra landscape zone of Northern Yakutia. According to the physiographic zoning scheme, the territory of the reserve belongs to the subregion of the Kolyma-Anabar coastal lowland tundra of the coastal continental lowlands and islands of the North Siberian lowland physiographic province. The location of the Ust-Lena Reserve is characterized in more detail by the scheme of geomorphological zoning of Northern Yakutia, proposed by B.G. Agapitov (1960); The “Deltovy” section is allocated as an independent region of the river delta. Lena, — the composition of the subregion of the Leno-Anabar lowland of the Northern lowland region; The mountain area is included in the subregion of the Primorsky ridge, allocated within the Kharaulakh Mountains region of the Verkhoyansk mountain system subregion of the mountain region of North-Eastern Yakutia.