Wilpattu National Park, one of the largest and oldest wild life sanctuary in Sri Lanka span an area of no less than 131,693 with altitude ranging between the sea-level and 152 meters. 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 in the Northwest coast lowland dry zone of Sri Lanka. while the period of drought is only during the months of May to early September, the main rainy season is during September to December with the heavy downpours of north eastern monsoon; inter monsoon season visits the park March and April. Wilpattu is among the top national parks world renowned for its Leopard and Sloth bears population. The park is consisting with many type of vegetation. Including Salt grass and low scrub monsoon forest with tall emergent’s, such as Palu (Manilkara hexandra), and Satin (Chloroxylon swietenia), Milla (Vitex altissima), Weera (Drypetes sepiaria), Ebony (Disopyros ebenum) and Wewarna (Alseodaphne semecapriflolia).
Wilpattu sanctuary is famous for its flora and fauna. 31 species of mammals have been identified within Wilpattu National Park. Mammals that are identified as threatened species living within the Wilpattu National Park are the elephant (Elephas maximus, Sloth bear (Melursus ursinus), leopard (Panthera pardus kotiya) and water Buffalo (Bubalus bubalis). Sambhur, spotted deer, mongoose, mouse and shrew are more of Wilpattu's residents. The Villus support a wide range of birdlife: endemic birds include the Ceylon Jungle fowl, Brown-capped Babbler, Ceylon Wood shrike and Black-capped Bulbul in revering habitats.
Countless species of birds can be found and the park plays host to numerous winter migrants from November to March, while menacing crocodiles top the list of reptiles.Butterflies recorded include the Great Eggfly, Blue Mormon, Common Mormon, Common Rose Great Orange Tip, Glad-eye Bushbrown, Blue Mormon, Common Mormon, Common Rose and Crimson Rose.
The park renowned for its history, The Mahavansa records that in 543 BC Prince Vijaya landed at Tambapanni now known as Kudrimalai Point (Horse Point), married Kuweni and founded the Sinhala nation. In 1905 the area was designated a sanctuary and in 1938 it was upgraded to the National Park status.