Tissa Wewa, artificial lake located near Tissamaharama
Tissa Wewa is an artificial lake in Anuradhapura, Sri Lanka, held back by a long earthen dam that forms one of the oldest surviving reservoirs on the island. Water from the lake flows through an ancient canal network that still connects to surrounding farmland and temple grounds.
The reservoir was built in the 3rd century BC under King Devanampiya Tissa to supply the growing capital of Anuradhapura with water. Later rulers expanded the system by adding canals that reached farther parts of the city and its religious monuments.
The name of the lake comes from King Devanampiya Tissa, and locals still gather along its banks at sunset to watch birds and enjoy the open water. Nearby Buddhist temples have long regarded the lake as part of the sacred geography of the ancient city.
The area around the lake is accessible year-round and easy to explore on foot or by bicycle, with the path along the dam offering a good vantage point over the water. Early morning is a good time to visit, as bird activity is high and the light over the lake is at its best.
The dam was built without mortar, relying entirely on compacted earth and clay to hold back the water, which was a highly advanced technique for its time. The same method was used across many other ancient reservoirs in Sri Lanka, suggesting that engineers shared knowledge across different construction projects.
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