Gahar Lake is located in the eastern side of Lorestan and in the skirts of Oshtorankuh Mountain. This Lake is one of the most beautiful mountainous lakes of the country. Gahar Lake is formed of the snow on Oshtorankuh melting and being gathered behind the dam that has appeared by flowing on the mountain. The length of the major lake is one and a half kilometers and its average width is 600 meters. The maximum depth of the lake is 28 meters and its area is about 100 hectares and it is located 2400 meters from sea level.