Yamdrok Lake is one of the four largest sacred lakes in Tibet. It is over 72 km (45 miles) long. The lake is surrounded by many snow-capped mountains and is fed by numerous small streams. The lake does have an outlet stream at its far western end. Around 90 km to the west of the lake lies the Tibetan town of Gyantse and Lhasa is 100 km to the northwest. According to local mythology, Yamdok Yumtso lake is the transformation of a goddess.