Wilpattu National Park is a park located on the island of Sri Lanka. The unique feature of this park is the existence of "Willus" (natural lakes) - natural, sand-rimmed water basins or depressions that fill with rainwater. Located on the northwest coast lowland dry zone of Sri Lanka. The park is located 30 km (19 mi) west Anuradhapura and 26 km (16 mi) north of Puttalam (approximately 180 km (110 mi) north of Colombo). The park is 1,317 km2 (508 sq mi) (131, 693 hectares) and ranges from 0–152 m (0–499 ft) above sea level. Nearly one hundred and six lakes (Willu) and tanks are found spread throughout Wilpattu. Wilpattu is the largest and one of the oldest National Parks in Sri Lanka. Wilpattu is among the top national parks world-renowned for its leopard (Panthera pardus kotiya) population. A remote camera survey was conducted in Wilpattu from July to October 2015 by the Wilderness and Wildlife Conservation Trust. A sample of forty nine individual leopards were photo-captured in the surveyed area and the core area density was between that of Yala National Park's Block-I and Horton Plains National Park.