Lake Ugii is a fresh water lake located in steppe, it is 25 sq km in area, 7 km long and 5 km wide. At its deepest the lake is 15m. Ice sheets form over Ugii lake between November and May. Researchers have discovered 14 different species of fish, 27 species of floating plants, and 48 species of floating animals.

It is a stopover point for more than 150 species of migrating water birds. Ugii lake has been registered as part of the east-north Asian international networking system that protects goose and duck flocks, due to the large populations of cape barren goose and a spoon bill in the lake. Also, this lake is worshiped, so locals prohibit women from getting in to the water. In 1971, Ramsar convention registered Ugii lake as a protected water ecosystem.