Tsisperi Tba (Blue Lake) is a karst lake in northwestern Georgia, in Abkhazia (Gagra municipality). It lies on the right bank of the middle course of the Bzipi River, at 109.5 m. Surface area 0.0012 km², greatest depth 23 m, average depth 15 m, volume 18,000 m³. A powerful vauclusian spring rises from the lake bed, and a stream flows out of the lake. The water is clean and transparent; in summer its temperature is 8.5°.