A Yak grazing at the foot of Lake Yamdrok, also known as Yamdok Yumtso. Yamdrok Lake in Tibetan, is called Yumtso Yamdrok is one of the three largest sacred lakes in Tibet, has more than 72 km (45 miles) long, surrounded by many mountains and snow elimentado by numerous streams. South of the lake, there is an output current at its western end.