Tibet. In addition, 41 other rivers flow through Lhoka. The river flowing from west to east has a river area of and flows for through seven counties namely, Nanggarze, Gonggar, Chahang, Nedong, Sangri, Qusum and Gyacha. In addition, there are 88 lakes of which the important ones are the Yamdrok Lake, the Chigu Lake and the Purmo Yumco lake. The hydroelectric power potential of the river system of Shannan has been assessed at 35.1 million kW. However, the power generated at present is only 18,300 kW. Divine lakes Yamdrok Yumtso Lake Yamdrok Yumtso Lake, appears like jasper in a dark blue colour and it is one of the four holy lakes in Tibet. Viewed from the top of the Gampala Pass (), the lake appears in the shape of a scorpion. It is located in Nhagartse County on the way to Gyantse and is from Tsedang Yumtso. It is situated at an altitude of and has a very large area of , with a shoreline of . The average depth of water in the lake is about with deepest depth reported to be . There are many Tibetan fish species in the lake. Aqua fauna noted in the lake have been listed as wild duck, goose and many other species. Yamdrok Lake, also known as Yamḍok Yumtso, is one of the three largest sacred lakes in Tibet and is over long with an area of . The lake is fan-shaped, spreading to the south but narrowing up to the north. The mountainous lakeshore is highly crenellated, with numerous bays and inlets. Lake Yamdrok freezes in winter. Like mountains, lakes are considered sacred by Tibetan people, the principle being that they are the dwelling places of protective deities and therefore invested with special spiritual powers. It is the largest lake in southern Tibet and home to the famous Samding Monastery which is on a peninsula jutting into the lake. Samding Monastery is where Dorje Phagmo, one of the few important female lamas in Tibet, stayed and presided, and stands to the south of Lake Yamdrok Yumtso. The Yamdrok Hydropower Station was completed and dedicated in 1996 near the small village of Pai-Ti at the lake's western end. This power station is the largest in Tibet. The Holy Lake The Holy Lake, also known as the Lhamo Latso, in Gyaca County, is an alpine lake seen in the shape of horse's hoof