- Haikou city is the capital and largest city of Hainan Province, China. It is located on the northern coast of the island and is known for its tropical climate, beautiful beaches, and lush greenery. The city has a rich cultural heritage, with historical sites like the Temple of Five Lords and the Haikou Clock Tower. It is also a popular tourist destination, attracting visitors with its modern shopping malls, vibrant nightlife, and water sports activities. Haikou is often referred to as the "Coconut City" due to its abundant coconut trees and is known for its delicious seafood cuisine.