Remains of the pre-200 C.E.
Sa Huỳnh culture have been found on the islands. The
Cham used Ly Son as a transhipment base. Xó La well, one of the wells used to provide fresh water for ships, still remains on the shore of the main island and is still in use. The islands were used as a geographical landmark for navigation by Admiral
Zheng He's crew during the 15th-century
treasure voyages. In the 17th century the
Nguyễn lords started a colony on the islands from An Vĩnh,
Bình Sơn district, in
Quảng Ngãi, as part of the activities of the
Hoàng Sa Company's development of the
Paracel Islands. During the United States involvement in the
Vietnam War, Lý Sơn was the site of a U.S. Navy
radar installation that was used to track shipping along the Vietnamese coast. ==Economy==