Hainan Island is China's most southerly province and the second largest island after Taiwan, the largest ocean island and the smallest land province in China, located in the South China Sea about 60 minutes south of Hong Kong by air. The closest city by flight to Hainan Island is Guangzhou (Canton), only 50 minutes to Haikou , the capital city of Hainan island, and 70 minutes to Sanya .