Turtle Lake is a direct English translation of Kus Tba, a small lake at the outskirts of Tbilisi, the capital of Georgia. The other, less frequently used name of this lake is K'ork'i. Turtle Lake - or Kork Lake - is a lake in Georgia, in the city of Tbilisi. It is located southwest of the city center, on the northern slope of the Mtatsminda ridge, at an altitude of 686.7 m …Turtle Lake is a direct English translation of Kus Tba, a small lake at the outskirts of Tbilisi, the capital of Georgia. The other, less frequently used name of this lake is K'ork'i. Turtle Lake - or Kork Lake - is a lake in Georgia, in the city of Tbilisi. It is located southwest of the city center, on the northern slope of the Mtatsminda ridge, at an altitude of 686.7 m above sea level. Surface area 0.034 km, basin area 0.4 km, maximum depth 2.6 m, average depth 1.7 m. The length of the lake is 180 m and the width is 50 m. Placed in a small pan, it was formed by exotectonics - mainly as a result of landslide rocks.