as well as 27 bat species. Furthermore, 233 bird species, 43 reptile and amphibian species among them the king cobra and the Vietnamese salamander (Paramesotriton deloustali), have been recorded. In Ba Be lake, 106 fish species from 61 genera, 17 families, and 5 orders have been recorded. The park is also noteworthy for its diversity in butterflies for which 354 species have been recorded. Scenic landscape features Puong Cave is a large cave in the north of the park through which the Nang River flows. The main cave is up to 50 meters high and about 300 meters long. It is inhabited by a population of 5 to 10 000 bats belonging to 18 species. The "Fairy Pond" is rock basin filled with clear water which seeps through the surrounding limestone rock. The Dau Dang Waterfall is formed by the Nang River. It consist of a sequence of rapids which stretch over a length of almost one kilometer. Widow Island is a small, cone-shaped islet near the center of the southern lake. According to the local legend, the islet was once the home of an old widow who was spared from a flood through divine intervention. National park and infrastructure Ba Bể National Park was established in 1992, it covers an area of 100.48 km2. Facilities include an information center, guest houses, a lake management station, and an ecological research station opened in 2004. Researches External links Bắc Kạn province official site Vietnam National Parks National parks of Vietnam Geography of Bắc Kạn province Protected areas established in 1992 Tourist attractions in Bắc Kạn province ASEAN heritage parks Ramsar sites in Vietnam