Eth pokuna (Elephant pond) is an ancient man made pond situated close to Lankaramaya. It is 159 meters in length 52.7 meters across and 9.5 meters in depth with the holding capacity of 75,000 cubic meters of water.

The water to this pond has been supplied from the Periyamkulama Tank through a network of underground canals. These underground canals still work after so many hundreds years. This tank probably has been used by the monks in the Abhayagiri Buddhist Monastery who amounted over five thousand priests.