The karst formation of Phong Nha-Ke Bang National Park has evolved since the Palaeozoic (some 400 million years ago) and so is the oldest major karst area in Asia.

• 丰芽格邦国家公园的喀斯特地貌的形成是从古生代（大约40亿年前）开始的，是亚洲最古老的喀斯特地貌。