西藏是中国海拔最高、湖泊最多的省区，藏北内流区则集中了西藏最多的湖泊和大湖。其中位于藏北内流区东南部、藏语意为天湖的纳木错，则是西藏面积（１９４０ｋｍ２）最大和海拔（４７１８ｍ）最高的大湖。前人仅少量报道过该湖的湖岸阶地与古湖岸线，并推论该湖在青藏高原的 Tibet is the highest elevation and the largest lake in China. The innermost stream in Tibet is the largest lake and the largest lake in Tibet. Among them, Nam Co is located in the southeastern part of the inner-stream flow in the northern part of Tibet, with the Tibetan language meaning Tianhu. It is the largest lake with the largest area of ​​Tibet (1940 km2) and the highest elevation (4718 m). Only a small number of predecessors reported the lakeshore terrace and the ancient lake coastline, and inferred that the lake in the Tibetan Plateau