Lhünzê County covers an area of 10,566 square kilometers, and the actual control area is 8,165 square kilometers. The terrain is higher in the west and lower in the east, with an average altitude of 3,900 meters. The lowest point is Zhongna Village in
Tsari Township and Doyü Village in Doyü Lhoba Ethnic Township, with an altitude of 3,000 meters. In the south are the Himalayas with an altitude of over 5,000 meters. The altitude of the middle and upper reaches of the mountains is between 3,900 and 4,300 meters, with wide river beaches and grasslands. Deeply formed valleys, there are Lhünzê River, Xiongqu, Luoluoqu, Jiaboqu, Yumenqu, Jijiaqu and other rivers, 65 large and small lakes, with a total area of 33 square kilometers, and groundwater reserves of more than 50 million cubic meters. The amount of resources that can be developed and utilized is 100,000 kilowatts, and there are 15 hydropower stations with a total installed capacity of 4,750 kilowatts. The annual average temperature is above 5 °C, the annual average sunshine hours are about 3,000 hours, the annual frost-free period is 238.3 days, and the annual average precipitation is 279.41 mm, mainly concentrated in May–October, accounting for 96.8% of the annual precipitation. The
Subansiri River, the largest tributary of the
Brahmaputra, is formed in the county. A number of sub-tributaries such as Tsari Chu, Charme Chu, Nye Chu and Loro Chu, flow through the county, and join in the adjoining
Upper Subansiri district of
Arunachal Pradesh in India. ==Administrative divisions==