Well, technically termites, not ants – and despite having lived a few years in Southern India, I still never learned much about the various species – but you can generally recognize them by the shape of their mounds. I discovered this one somewhere between Bangalore and Shravanabelagola.
I remember reading somewhere that these mounds grow on average as little as 1 cm per year – and if that’s true, these are very old mounds.
You can see my other Amazing Ants photographs here: