Lunugamvehera National Park in Sri Lanka was declared in 1995, with the intention of protecting the catchment area of the Lunugamvehera reservoir and wildlife of the area. The national park is an important habitat for water birds and elephants. The catchment area is vital to maintain the water levels of the five tanks in the down stream of Kirindi Oya and wetland characteristics of Bundala National Park. This national park also serves as a corridor for elephants to migrate between Yala National Park and Udawalawe National Park. The national park is situated 261 km (162 mi) southwest from Colombo. After being closed because of the Sri Lankan civil war, the national park is now open to the general public.
Lunugamvehera is in the Dry zone of Sri Lanka, therefore the park is exposed to annual drought, relieved by the south western monsoon. The elevation of the park is 91 metres (299 ft). Out of 23,498 hectares of total land area 14 percent, that is 3283 ha, is land under the reservoir. Another 50 ha are two smaller reservoirs. Nearby Thanamalvila area receives a 1,000 millimetres (39 in) of annual rainfall. Rainfall decreases from North to South and West to East across the national park. Mean annual temperature of Lunugamvehera is 30 °C (86 °F).