越池市
The Xuân Sơn National Park was established on February 2002. It is located approximately 80 km from Việt Trì City. The park covers an area of , with more than of natural forests and of limestone-mountain forests. The park is biologically rich with some 465 species of upper plants and 282 species of fauna, including 23 species of amphibians, 30 species of reptiles, 168 species of birds and 61 species of mammals. Rarer species, such as Tibetan bears, white pheasants, gray gibbons, and cobras are common in the park. The highest points of the park are Mount Voi (1,387m), Mount Ten (1,244m) and Mount Cẩn (1,144m). There are extensive grottoes and caves running 7–8  km inside these mountains; they contain large populations of bats.