Ak-Sai is a broad alpine valley located in the border area between At-Bashy and Torugart, situated at an altitude of 2900-3800 meters, in inner Tien-Shan. Ak-Sai valley surrounded by mountains, 3900-5000 meters high, covered with glaciers. Sub-alpine semi-deserts (up to 3100-3600 meters), alpine meadows, tundra in some areas (3600-3900 meters), and nival-glacial zone (above 3900 meters) are typical to the valley. The vegetation consists of short, thick grass that covers numerous swamps and lakes at moderate altitudes. Marco Polo sheep and alpine ibex are famous inhabitants of the valley.