Phu Quoc, the largest island in Vietnam, lies in the Gulf of Thailand, 45 km from Ha Tien and 15 km south of the coast of Cambodia. Phu Quoc Island, part of Kien Giang province, is also part of an archipelago consisting of 22 islands of all sizes. The island covers an area of 585 km2 and is 50 km long. Phu Quoc is also called the Emerald Island because of its natural treasures and infinite tourism potential. The island is well known for its high-quality fish sauce; Phu Quoc fish sauce smells particularly good since it is made from a small fish, ca com, with a high level of protein. The island produces 6 million liters of fish sauce every year. Phu Quoc Island has many harbors such as An Thoi and Hon Thom where international and domestic ships anchor. Also, there are several historical sites on the island: National Hero Nguyen Trung Truc's military base, Gia Long King relics from the time he spent on the island, and Phu Quoc prison.