The Tissa Wewa is the largest and oldest of four artificial tanks (man made reservoirs) in the area and was constructed in the 3rd Century BC by King Yatala Tissa, the founder of the Ruhuna Kingdom. Today, with its remarkable bird life, it provides the scenic backdrop to the town. Water from the Tissa Wewa and the other tanks is used to irrigate the paddy fields near Tissa keeping the surroundings lush and green year round. Especially at dawn and sunset, the Tissa Wewa, part of the WirawilaBird Sanctuary is a great place to see a variety of water-bird life. During the weekends the tanks are a place for Sri Lankans to wash and swim.