What is the largest uninhabited island in China?

The largest uninhabited island in China is Diaoyu Island.

Diaoyu Island, also known as Diaoyutai, Diaoyu Island and Diaoshan, is the main island of Diaoyu Island in the East China Sea of China and the inherent territory of China. It is located at 25 44.6' north latitude and123 28.4' east longitude, about 358km away from Wenzhou, Zhejiang, 385km away from Fuzhou, Fujian, 0/90km away from Keelung, Taiwan Province, and the surrounding sea area is about174,000 square kilometers. It is about 364 1 m in length, 0/.905 m in width, 3.9 1 km2 in area, and the highest elevation is about 362 meters. The terrain in the north is relatively flat, the rocks in the southeast are steep, the rocks in the east are like spires, and the mountains in the middle cross the east and west. Diaoyu Island is rich in precious Chinese herbal medicines such as camellia, palm, cactus and hibiscus. There are a large number of seabirds living here, and it has the reputation of "Flower and Bird Island".