Lake Teletskoye (Russian: Телецкое озеро, lit. 'the lake of the '; Altay: Алтын Кӧл, romanized: Altyn Köl, lit. 'Golden Lake') is the largest lake in the Altai Mountains and the Altai Republic, Russia, and has depth up to 325 meters. About 70 rivers and 150 temporary streams flow into the lake, the largest of them, Chulyshman 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 the Katun River, forms one of Siberia's largest rivers, the Ob River.