Koteshwar Mahadev is one of the adored deity of Kumarsain & nearby area. According to legends deity has driven from Mahadev Kedarnath in Uttaranchal. Koteshwar Mahadev Temple is located in village Mandoli of Kumarsain. Koteshwar is one of the avtara of Lord Shiva. According to local people Mahadev come out of the temple only once in four years and a great fair takes place.