View of the entrance of the Phong Nha Cave, with its underground river, its turquoise colored waters, small touristic rowing boats and the quays, Phong Nha-Ke Bang National Park (Phong Nha-Kẻ Bàng) - Quang Binh Province - North Vietnam. - Stock-Fotografie

Picture shows the entrance of the Phong Nha Cave, the most visited and main attraction of the Phong Nha-Kẻ Bàng National Park, located in the village of Phong Nha, in Northern Vietnam. The cave is crossed by an underground watercourse of around 7,7 km with turquoise colored waters, visible in the picture, and is only accessible with small blue touristic boats, also visible in the picture, from where tourists can admire the landscape. A small portion can be visited by foot on a boardwalk. The National Park encompasses the karst tropical landscape of the Northern Annamite mountain range and a network of more than 300 underground caves. It is classified as an UNESCO World Heritage Site since 2001.