Also known as " The Dark Blue Pearl ",  Lake Khovsgol is Mongolia 's largest and deepest lake. Located in the northernmost province, it is the largest tributary stream of  Lake Baikal in Russia . Lake Khuvsgul is 136 km long,36 km wide, 262 metres deep and is located at an altitude of 1645 m above sea level and is frozen from January until April or May. It's the second largest fresh water lake in Central Asia . It's inhabited by nine species of fish including the Siberian grayling and lenok. Fishing and sport fishing are becoming popular in the lake area. Taiga Fauna and Flora,Tsatan, practicing raindeer breeding are the main attractions for tourist. A ferryboat operates between Khatgal and Khanh, two towns on the southern and northen shores of the lake that is within the boundaries of the Khovsgol National Park .  Different ethnic groups live in the area: Khalh, Darhadt, Butyat. Tsaatans are raindeer herders. Lake Khovsgol is on the important migration route for birds from Siberia , thus facilitating marvelous opportunities for birdwatching.