The largest and  the most beautiful lakes in the region , which is located within 75 km northeast of Qazvin . it's length in longest part is 325 meters and it's width is 275 meters and it's depth is 1 to 5/7 meters. it's water is supplied from springs and rainfall and it's boiling state causing permanent filter and clean water. a small river is formed because of the overflow water from of the lake, it's water  May be used by farmers of " Kushak" and " Ayin" village. In summer the lake is the place of fishing , sailing and swimming and in fall a safe place for  migratory birds such as swan, goose , duck , and in the winter due to the freezing and cool weather , it's surface is suitable for ski.