Tissa Wewa is an ancient irrigation tank was built by King Devanampiya Tissa (250-210 BC). Only Panda Wewa and Abhaya Wewa are considered to be older than Tissa Wewa. The embankment of Tissa Wewa is 11,000 feet long (Two miles) and 25 feet high. The width of the top of the reservoir was found to be 12 feet to 18 feet. Base of the embankment is 160 feet. Tissa Wewa has an area of approximately 550 acres.