Mamraz Lake, also known as Arvah (Ghosts) Lake, is located 5 kilometers Vanosh Village in the Central District of Nowshahr County, Mazandaran Province. The lake lies in the middle of the broad-leaved dense forest in Molakola District. The lake is 700 meters long and 300 meters wide. There are dried trees in the lake that create as spectacular scenery. Arvah Lake stands in a completely virgin place passing through which the visitors may be faced with wild animals.