Construction is set to begin this year of two major bridges connecting China's largest group of offshore islands with the mainland. Xihoumen Bridge is a 5.3km suspension bridge costing US$300 million. The US$846 million Jintang Bridge will include an 18.5km section over the sea and approaches totalling 8.5km. The two bridges will be built under the second phase of a project to improve links with the Zhoushan Archipelago. Three bridges have already been completed.