Lonely Planet review for Naga Pokuna
Halfway back down the steep flight of steps from the Ambasthale Dagoba, a path leads to the left, around the side of Mihintale hill topped by the Mahaseya Dagoba. Here you’ll find the Naga Pokuna (Snake Pool), so called because of a five-headed cobra carved in low relief on the rock face of the pool. Its tail is said to reach down to the bottom of the pool. If you continue on from here, you eventually loop back to the second landing of the Stairway.