Kuttam Pokuna  
The Twin Ponds. 

These 3rd Century monks' bathing pools are archaeologically perfect. Observe the water input system to the pokuna. The water that feeds the ponds flows first into a filtering basin made of rock, It runs through a beautiful makara mouth and a lion's head into the smaller tank. 
A submarine conduit feeds the larger tank. Stone Pun Kalas on the side of the stone steps joing the twin ponds.

Across the Vatavandana Para, a little to the north, you turn right for the two ponds- recently restored 8th and 9th century ritual baths with steps from the university nearby. Thought called 'Twin Ponds' , one is over 10m longer than the other. You can see the under ground water supply channel at one end of the second bath