Turtle Lake is a direct English translation of Kus Tba (Georgian: კუს ტბა), a small lake at the outskirts of Tbilisi, the capital of Georgia, so named due to the perceived abundance of turtles living in these places. The other, less frequently used name of this lake is K’ork’i (ქორქის ტბა).

Turtle Lake is located on the wooded northern slope of Mtatsminda Mount at elevation of 686.7 m above sea level and fed by a small river Varazis-Khevi, a tributary to the Mtkvari (Kura). The area of surface is 0.034 km², while the catchment area is 0.4 km². Maximal depth is 2.6 m.