Koi was the more southerly of the two main Pomo villages in the southeastern section of Clear Lake in Lake County, California, United States.[1] Both it and the other triblet center, Elem, were located on islands near the shore and controlled territory on the mainland.[2] It was located on Lower Lake Island, also called Indian Island.[3]
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38°56′25″N 122°38′40″W / 38.9402°N 122.6445°W / 38.9402; -122.6445