Lake Tanay is located in the Gorodok district of the Vitebsk region, 26 km north-east of the town of Gorodok, about 0.9 km south of the village of Verechye and belongs to the basin of the r. Oatmeal (pr. Tributary of the Usvecha river). The terrain is ridge-hilly, densely wooded, swampy. The surrounding forests are rich in blueberries, lingonberries, mushrooms, blueberries and raspberries. The lake is surrounded by a vast swampy floodplain (up to 350 m in the southwest), overgrown with bog-meadow vegetation and rare bushes. The shores are low, sandy (in places peaty and flooded), overgrown with bushes and woodlands, in places with forests. The shallow water is sandy, narrow, deeper the bottom is sapropelous. It grows significantly, and completely underwater vegetation. In the west, the Tanaika stream flows into the river. Oatmeal.