Qionghai, also called Keng Hai, is a county-level city in Hainan, China. It is located in the east of Hainan Island.

Kachek city was the capital of Keng Hai, which was the second largest city in Hainan island. Previous counties of Lok Wi and Keng dang were merged to create Kenghai. The town of Bo'ao, which serves as the seat for the Boao Forum for Asia, is located in the city of