Kara-Suu Lake () is a rock-dammed mountain lake in Toktogul District of Jalal-Abad Province of Kyrgyzstan. It is located at an elevation of between the Kengkol and Taktalyk mountains, northwestern spurs of the Fergana Range, at the headwaters of the Karasuu River, a left tributary of the Naryn River. An elevation of has also been reported for the lake in other sources. The lake has an area of , a volume of approximately , and a maximum depth of . It was formed when a large landslide blocked an ancient tectonic fracture, creating a natural dam through which water continues to seep. Ten streams flow into the lake, the largest being the outlet from the upstream Kapkatash Lake.
Geology and formation Karasuu Lake originated when a large landslide dammed an ancient tectonic fault zone following fault displacement. The resulting natural dam impounds the lake waters.
Hydrology Water from the lake seeps through the landslide dam and re-emerges approximately lower downstream. As a consequence, the lake's water level may fluctuate by up to .
Environmental issues The shoreline meadows are used as seasonal grazing grounds and overnight camps for livestock, mainly cattle. This has led to contamination of the lake by parasitic organisms. According to local reports, fish inhabiting the lake have been affected by disease associated with this contamination.
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