Köl-Suu (Kyrgyz: Көл-Суу, also Көлсуу) is an alpine lake in At-Bashy District of Naryn Region of southeastern Kyrgyzstan.

It is located at 3514 m elevation in the Kakshaal Too mountain range, central Tian Shan.

It is 5 km long, and its area is 4.5 km2 (1.7 sq mi).

[1] The river draining the lake starts from underground location and the water gushes out between the soil and rocks below the lake.

This Naryn Region location article is a stub.