The lonely mountain, also known as three stones, is located in the southwest of Qinghai Lake, 8 kilometers south of the lake and 20 kilometers from the Bird Island in the northwest. From a distance, it looks like three huge giant dings standing in the waves, the water beats the waves, and it is thrilling. The three stones are composed of reefs, gravel beaches and sand, about 700 meters long from east to west and 150 meters wide from north to south. The southern slope of the reef is relatively gentle, and the north is steep. The vegetation on the island is sparse, and there are gray vegetables, oxtails, etc. growing in the gap between the gravel, and the coverage is less than 5 [%].