This alkaline lake is situated at the Kenyan border on the bottom of the Gregory Rift part of the Great Rift Valley and about 250 Km from Arusha. It is surrounded by escarpments and volcanic mountains, with a small volcano in the north end of the lake in Kenya, and a larger volcano (Ol Doinyo Lengai 2.886m) to the Southeast of the lake. The lake measures 56 km long in the north/south axis by 24 km wide. Lake Natron has no outlet so his size varies according to the rainfall. This lake is known for the huge flocks of flamingos that gather at certain parts of the lake at the end of the rainy season.