Underground tanks seen in Rajasthan to store rainwater for drinking is called

The tankas are the traditional rainwater harvesting technique commonly found in the Thar Desert region of Rajasthan. Tankas are ancient underground water storage systems found in the arid regions of Rajasthan, India. They are used to store rainwater for drinking and irrigation purposes. The tanks are made of mud or stone and are often circular or oval-shaped. They are constructed by digging into the ground and lining the walls and bottom with waterproof materials. The tanks are typically fed by channels or small ponds, which collect rainwater from the surrounding catchment area during monsoon season. This allows the stored water to be used throughout the year, even during dry spells. Tankas are an important source of water for rural communities in the region and are an example of traditional water management techniques adapted to the local environment.