Knowra Phong Nha–Kẻ Bàng National Park Phong Nha–Kẻ Bàng National Park A protected area in central Vietnam where ancient limestone karst, extensive cave systems, and diverse forest ecosystems form a globally significant natural landscape.
Karst : A landscape shaped by the dissolution of soluble rock, especially limestone, producing features such as caves and sinkholes. Limestone dissolution created the park’s ridges, underground drainage, and cave systems.
Carbonic acid : A weak acid formed when carbon dioxide dissolves in water. Water containing carbonic acid slowly dissolves limestone and enlarges fractures.
Permian : A geological period lasting from about 299 million to 252 million years ago. Much of the region’s limestone originated in ancient marine environments during this period.
Cave tourism : Travel to caves for recreation, education, or guided exploration. Guided cave visits bring visitors to the park’s underground landscapes.
Quảng Bình province : A province in north-central Vietnam bordering Laos and the South China Sea. The park anchors a major natural heritage area within the province.
Limestone : A sedimentary rock composed chiefly of calcium carbonate, often formed from accumulated marine organisms. The park’s karst terrain developed in thick limestone formations.
Speleogenesis : The geological processes through which caves form and develop. It explains how water carved the park’s extensive cave systems.
Indochina : A Southeast Asian peninsula encompassing Vietnam, Laos, Cambodia, Myanmar, and Thailand. The park’s geological and biological history belongs to this broader region.
Son Doong Cave expedition : A guided multi-day trek through Son Doong Cave in Vietnam. The expedition is a tightly managed way to experience one of the region’s largest caves.
Ke Bang limestone massif : A large limestone mountain region in central Vietnam that contains Phong Nha–Kẻ Bàng’s karst terrain. Its cave-rich landscape is central to the park’s geological value.
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