Lake Teletskoye
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'''Lake Teletskoye''' (Altay language|Altay: '''Altyn-Köl''') is the largest lake in the Altay Mountains and the Altai Republic, Russia.
Situated at a height of 434 m above sea level, the lake is 78 km long and 5 km wide and lies between the mountain ridges Korbu and Al-tyntu. Its surface area is 233 km²; however, due to its considerable depth (325 m), the lake contains no less than 40 km³ of fresh water. The lake is surrounded by mountains of 600-1300 m in the northern part and about 1700-2400 m in the southern part.
About 70 rivers and 150 temporary streams flow into the lake, the largest of them, Tchulyshman River, supplying more than half of the lake's water. The lake is drained through a single outlet, the Biya River, which, after its confluence with Katun River, forms one of Siberia's largest rivers, the Ob River.
Teletskoe lake is included into Altaisky Nature Reserve. That reserve along with the Katun Natural reserve near mountain Belukha and Ukok Plateau Nature Refuge were listed as one of UNESCO World Nature Heritage Sites under name "Golden Mountains of Altai".
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