An important geological feature is the Ailik Lake area is the Kewu Fault, which runs in the northeast to southwest direction, from the Ailik Lake to the Lesser Ailik Lake (小艾里克湖, a.k.a. the Small Alike Lake, 45°45′35″N 85°34′13″E﻿ / ﻿45.75972°N 85.57028°E﻿ / 45.75972; 85.57028) and the dry Alan Nur lake (Chinese: 阿雅尔诺尔; pinyin: Āyǎ'ěr Nuò'ěr, or Chinese: 艾兰诺尔; pinyin: Àilán Nuò'ěr;[3] 45°42′00″N 85°23′00″E﻿ / ﻿45.70000°N 85.38333°E﻿ / 45.70000; 85.38333), which until 1915 was the end point of the Manas River.[2]