Cat Ba National Park covers an area of 15,200 hectares, including 9,800 hectares of forest and 5,400 hectares of sea surface. The park is divided into two main areas: the strict protection area of 800 hectares, which is the primary forest, and the ecological restoration area of 14,000 hectares.

The park is home to a diverse range of ecosystems, including limestone forest ecosystems, wet highland ecosystems, mangrove ecosystems, marine ecosystems with inshore reefs, and cave systems with distinctive habitat for bats.

The park's unique combination of ecosystems and biological richness makes it an ideal location for ecotourism. With its vast primeval forests, mysterious caves, and blue sea and islands, Cat Ba National Park offers a unique and unforgettable experience for visitors.