Major ports in Hainan include Haikou Port, Basuo Port and Sanya Port. There are 28 berths in total, of which 22 can take over 10,000 tonnes. Air services link Haikao with major cities in China. Highways connect towns and cities in the province . The construction of Guangdong-Hainan railway linking Zhanjiang in Guangdong to Sanya “ the first cross-sea railway in China “ has recently been completed. This railway connects Hainan with the mainland railway network.