These stones - often basalt rocks or erratic boulders - can be found in the centre of many major cities, as well as in remote villages.
The Nag Dhunga is a rock on which Lord Shiva once rested, identified as such by ancient Vedic priests, at a time when Brahmanism was spreading out from the Indian Subcontinent into the mountain regions of Nepal's Himalayas and to Mount Kailash in Tibet.
They have picnics in front of it during festivals and decorate it with vermilion powder, flowers and small amounts of cash, and often offer milk, beaten rice and fruit to the Nāga that live under or inside the Dhunga.
The technical perspective of naming of the Nag Dhunga might be due to presence of Ophiolite rocks, which appear to be snake-like.
The naming "Nag Dhunga" might be either due to presence of rocks with snake-like shape or appearance like a snake or both.