Area: 1,520.7 sq. km. Population: 1,803.4 thousand habitants (2006) Administrative divisions: - Districts: Hong Bang, Ngo Quyen, Le Chan, Kien An, Hai An, Duong Kinh, Do Son. - Rural districts: Thuy Nguyen, An Duong, An Lao, Kien Thuy, Tien Lang, Vinh Bao, Cat Hai, Bach Long Vi. Ethnic groups: Viet (Kinh), Hoa, Tay, Nung...

The largest island in Halong Bay, Vietnam, Cat Ba Island, Vietnam is home to the Cat Ba National Park. The Cat Ba National Park covers an area of nearly 200 square kilometers