The Harappan Civilization has its earliest roots in cultures such as that of Mehrgarh, approximately 6000 BC. The two greatest cities, Mohenjo-daro and Harappa, emerged. 2600 BC along the Indus River valley in Punjab and Sindh. The civilization, with a possible writing system, urban centres, drainage infrastructure and diversified social and economic system, was rediscovered in the 1920s also after excavations at Mohenjo-daro in Sindh near Larkana, and Harappan cities, in west Punjab south of Lahore. A number of other sites stretching from the Himalayan foothills in the east Punjab, India in the west, to Gujarat in the south and east, and to Balochistan , Pakistan in the west, have also been discovered and studied.
Although the archaeological site at Harappa was damaged in 1857 when engineers constructing the Lahore-Multan railroad used brick from the Harappa ruins for track ballast, an abundance of artefacts have nevertheless been found. Because of the reduced sea-levels, certain regions in the late Harappan period were abandoned. Towards its end, the Harappan civilization lost features such as writing and hydraulic engineering. As a result, the Ganges Valley settlement gained prominence and Ganges' cities developed.
The earliest recognisably Harappan sites date to 3500 BC. This early phase lasts till around 2600 BC. The civilization's mature phase lasted from 2600 BC to 2000 BC. This is when the great cities were at their height. Then, from around 2000 BC, there was a steady disintegration that lasted till 1400 BC – what is usually called Late Harappan. There is no sign that the Harappan cities were laid waste by invaders. The evidence strongly points to natural causes. A number of studies show that the area which is today the Thar Desert was once far wetter and that the climate gradually became drier.
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