The waters of Tenis are fresh. The western section of the lake is also known as Saltaim. Both parts are connected by a
sound over 2 kilometers (1.2 mi) wide. The Tenis-Saltaim lake is the largest of the Krutinka Lake group. The Ust-Logatka and Ust-Kiterna settlements of
Krutinsky District are located by the lake. The
Osha river flows across Tenis and minor rivers such as the Karasuk, Balka-Sukhaya and Tleutsay flow into it. The shores are generally low, they are marshy in some places. Very close to the north lies a cluster of smaller lakes, including Synkul, Kalykul, Sazykul, Gorkoye and Achikul. ==Fauna==