<P> at Mohenjo - daro in Sindh, Pakistan . Archaeological evidence indicates that the Great Bath was built in the 3rd millennium BC, soon after the raising of the "citadel" mound on which it is located . </P> <P> The Great Bath of Mohenjo - daro is called the "earliest public water tank of the ancient world". It measures 11.88 × 7.01 metres, and has a maximum depth of 2.43 metres . Two wide staircases, one from the north and one from the south, served as the entry to the structure . A 1 metre wide and 40 centimetres high mound is present at the ends of these stairs . A hole was also found at one end of the Bath which might have been used to drain the water into it . </P> <P> The floor of the tank was watertight due to finely fitted bricks and mud laid on edge with a kind of plaster and the side walls were constructed in a similar manner . To make the tank even more watertight, a thick layer of bitumen (waterproof tar) was laid along the sides of the pool and presumably also on the floor . Brick colonnades were discovered on the eastern, northern and southern edges . The preserved columns had stepped edges that may have held wooden screens or window frames . Two large doors lead into the complex from the south and other access was from the north and east . A series of rooms were located along the eastern edge of the building and in one room was a well that may have supplied some of the water needed to fill the tank . Rainwater also may have been collected for the purpose, but no inlet drains have been found . It had a long bathing pool built with waterproof bricks . </P>

Note on the great bath of mohenjo daro