Ogii is one of the biggest lakes in Mongolia and located in Arkhangai province. It has 25.7 km squire area, average depth is 6.64m, in some sections 15.3 m and coastal length is 24.7 km. It is quite stunning place for birdwatching, fishing and swimming. There are 150 sorts of extremely rare and rare species birds of passage come to settle down on the "Ogii" lake. Also the "Ogii" lake has 14 sorts of fish belonged to the North Atlantic ocean area such as Esoc lucius, Rutilus lacustrisl, Perca fluviatilis, leucisous idus, Cyprinus carpio haematopterus, Parassius auratus gibelio, lota, Leuciscus baicalensis, Phoxinus pall, Phoxinus peronurus, Barbatula, Toni, Cobitus taenia sibisica and has plenty of fish reserves.