architecture, and unearthed large numbers of antiquities such as, animal bones, gold, silver, terracotta ornaments, pottery and bronze vessels. Archaeologists believe that Dholavira was an important centre of trade between settlements in south Gujarat, Sindh and Punjab and Western Asia. Architecture and material culture Estimated to be older than the port-city of Lothal, the city of Dholavira has a rectangular shape and organization, and is spread over . The area measures in length, and in width. Unlike Harappa and Mohenjo-daro, the city was constructed to a pre-existing geometrical plan consisting of three divisions – the citadel, the middle town, and the lower town. The acropolis and the middle town had been furnished with their own defence-work, gateways, built-up areas, street system, wells, and large open spaces. The acropolis is the most thoroughly fortified and complex area in the city, of which it appropriates the major portion of the southwestern zone. The towering "castle" stands is defended by double ramparts. Next to this stands a place called the 'bailey' where important officials lived. The city within the general fortifications accounts for . There are extensive structure-bearing areas which are outside yet integral to the fortified settlement. Beyond the walls, another settlement has been found. The most striking feature of the city is that all of its buildings, at least in their present state of preservation, are built of stone, whereas most other Harappan sites, including Harappa itself and Mohenjo-daro, are almost exclusively built of brick. Dholavira is flanked by two storm water channels; the Mansar in the north, and the Manhar in the south. In the town square, there is a area high above the ground, called the "Citadel''. Reservoirs Bisht, who retired as the Joint Director-General of the ASI, said, "The kind of efficient system of Harappans of Dholavira, developed for conservation, harvesting and storage of water speaks eloquently about their advanced hydraulic engineering, given the state of technology in the third millennium BCE." One of the unique features of Dholavira is the sophisticated water conservation system of channels and reservoirs, the earliest found anywhere in the world, built completely of stone. The city had massive reservoirs, three of which are exposed. They were used for storing fresh water brought by rains or to store water diverted from two nearby rivulets. This clearly came in response to the desert climate and conditions of Kutch, where several years may pass without