an intermontane area within the Pamir-Alai mountain system in the Kirghiz SSR. The valley extends 150 km from west to east between the Alai and Trans-Alai ranges, with widths between 8 and 25 km. The valley has an area of around 1,700 sq km, with an elevation from 2,240 m in the west to 3,536 m in the east (Tomurun Pass). The Kyzyl-Su River and its tributaries run through the valley. The valley floor is formed by alluvial and proluvial deposits. (“Proluvial” refers to soil leached by rock fragments.) In the south and in areas in the middle, the valley floor is composed of a range of morainic hills. There are mountain pastures, with irrigated land in the west along the Kyzyl-Su River.
N. A. GVOZDETSKII