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In page Ulan-Ude:

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Ulan-Ude is traversed by two rivers, the Selenga and Uda. The Selenga provides the greatest inflow to Baikal Lake, supplying 50% of all rivers in its basin. The Selenga brings about 30 cubic kilometers (7 cubic miles) of water into the lake per year, exerting a major influence on the lakewater's renewal and its sanitary condition. Selenga is the habitat of the most valuable fish species such as Omul, Siberian sturgeon, Siberian taimen, Thymallus and Coregonus.[citation needed]