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 (152 mi) southeast of Colombo.

Tissa Wewa is a reservoir in Tissamaharama, thought to have been constructed in the 3rd century BC, either by Mahanaga of Ruhuna or his successor Yatala Tissa of Ruhuna, in order to irrigate paddy lands and supply water to the flourishing city of Tissamaharama. The lake was restored in 1871.