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. The three stone islands are not open yet, and tourists can only view them from a distance on land. You can take pictures of the landforms and birds on the island with a large long-focus lens. From a distance, it looks like three huge giant dings standing in the waves, the water beats the waves and 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 island is sparsely vegetation, only in the gravel gap growth of gray vegetables, oxtails, etc. This is one of the most populated islands in Qinghai Lake birds, and the number of birds now inhabiting the reef has exceeded the bird island. The best season to go to the lonely mountain is April to August.