Khanka Nature Reserve (Russian: Ханкайский заповедник Khankaiskiy zapavyednik) (also Khankaisky) is a Russian 'zapovednik' (strict nature reserve) that covers portions of the shore and waters of Lake Khanka, the largest freshwater lake in the Russian Far East. It is an important area for nesting and migrating waterfowl and other birds. The reserve is divided into five distinct sectors on the southern and eastern shores of the lake. The reserve is situated in the Spassky District, in the southwest of Primorsky Krai. It was formally established in 1990, and covers an area of 437 km2 (169 sq mi). It is part of a UNESCO Biosphere Reserve.