Ogii lake, locates on the centre of Mongolia, in the territory of the Arkhangai province, is one of the biggest lakes of Mongolia and has 27 km squire area. Average depth is 6.64m, in some sections 15.3m, coastal length is 23.5m. The lake abounds in various types of fish and birds, which create an incredible natural beauty. There are 150 sorts of extremely rare and rare species birds of passage come to settle down on the Ogii lake. It is home for cranes and ducks, also Swan Goose, White Spoonbill and Dalmatian Pelican have been recorded. Ogii lake has 14 sorts of fish belonged to the North Atlantic ocean area such as Esoc lucius, Rutilus lacustrisi, Perca fluviatilis, Leucisous idus, Cyprinus carpio haematopterus and so on. Delicate sand and whetstone coast, the soft wave makes an area is very convenient to have boat adventure. Also it is enthusiastic place for swimming, having sunbath, bird watching, fishing, horse and camel ridding and hiking.