The Great Bath is one of the best known structures among the ruins of the ancientIndus Valley Civilization. Archaeological evidence indicates that the Great Bath was built in the 3rd Millenium BCE, just sometime after raising of the "citadel" mound on which it is located.
The Great Bath of Mohenjedaro is called as "Earliest public water tank of the ancient world". The Great Bath measures 11.88 metres X 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 meter wide and 40 centimeters mound at present at end of these stairs.
Another view of the Great Bath A hole was also found at one end of the Bath which might have been used to drain the water into it.
The Great Bath is built of fine baked bricks lined with bitumen (natural tar - presumably to keep water from seeping through), which indicates that it was used for holding water. Many scholars have suggested that it could have been a place for ritual bathing or religious ceremonies, but the actual use is not clear.