Phu Quoc is the largest island of Vietnam. Situated in the Gulf of Thailand, the island is part of Kien Giang province. The district of Phu Quoc includes the island proper and 21 smaller islets. The district seat, Duong Dong, which is located on the west coast, is also the largest town on this island, whose total area is 574 km².

Phu Quoc island lies 115 km from Rach Gia Town. Roughly triangular in shape the island is 50 km long north to south and 25 km east to west in the north at its widest.

A mountainous ridge of "99 peaks" runs the length of Phu Quoc with Chua Mountain (603m) being the tallest.

The island’s monsoonal sub-equatorial climate is characterized by distinct rainy (June to November) and dry seasons (December to May). The annual rainfall is high averaging 2,879 mm. In the northern mountains up to 4,000 mm have been recorded. April and May are the hottest months with temperature reaching 35 °C.