Bundala National Park is an internationally important wintering ground for migratory water birds in Sri Lanka. Bundala harbors 197 species of birds, the highlight being the greater flamingo, which migrate in large flocks. Bundala was designated a wildlife sanctuary in 1969 and redesignated to a national park on 4 January 1993. In 1991 Bundala became the first wetland to be declared as a Ramsar site in Sri Lanka. In 2005 the national park was designated as a biosphere reserve by UNESCO, the fourth biosphere reserve in Sri Lanka. The national park is situated 245 kilometres southeast of Colombo.
The area was declared a wildlife sanctuary on 5 December 1969 and was upgraded to a national park on 4 January 1993 with land area of 6,216 hectares. However the park was regazetted in 2004 and the original park was reduced to 3,698 hectares. In 1991, Bundala became the first site in Sri Lanka to be designated a Ramsar wetland. In 2005, Bundala was declared a Man and Biosphere Reserve by UNESCO. In January 2006, an area adjacent to Bundala covering an area of 3,339.38 hectares was declared as the Wilmanna Sanctuary.