The Rara Lake (Nepali: रारा ताल) is the biggest and deepest fresh water lake in the Nepal Himalayas. It is the main feature of the Rara National Park, located in the Jumla and Mugu Districts. In September 2007, the lake was declared a Ramsar site, covering 1,583 ha (6.11 sq mi) including the surrounding wetlandMore species of birds (236) nest around Rara Lake than people visited in 2010 (170). Yet the largest lake in Nepal, ensconced within its smallest national park, is only three hours walk from an airstrip. It’s a beautiful, calm haven surrounded by forests, and a paradise for bird watchers. Rara Lake lies at an altitude of 2,990 m (9,810 ft) above sea level, has a water surface of 10.8 km2 (4.2 sq mi), a maximum depth of 167 m (548 ft), is 5.1 km (3.2 mi) long and 2.7 km (1.7 mi) wide. It drains into the Mugu Karnali River via the Nijar River.Its water quality is characterized by high pH, conductivity and total hardness. It was reported to be very slightly polluted and was classified as oligotrophic in limnological terms. It is polluted due to wastes produced during festivals by visiting locals and tourists.