Wilpattu National Park, the largest wildlife sanctuary in Sri Lanka span an area of no less than 131,693 hectares with altitude ranging between the sea-level and 152 meters.
Wilpattu National Park is situated in the dry zone, and is unlike any other wildlife sanctuary in Sri Lanka. A unique complex of over 50 wetlands called “Villu” is the most prominent topographical feature of the national park. ‘Villu’ are shallow natural lakes filled with rainwater surrounded by open grassy plains amidst the dense scrub jungle. The presence of these Villus with an abundance of water can best be explained in the weather patterns that prevail over the park: 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. Annual temperature in the Park is around 27.2 Celsius and its annual rainfall is approximately 1000 mm.