25th century BC(26th century BC - 25th century BC - 24th century BC - other centuries)
- 2900 - 2334 BC -- Mesopotamian wars of the Early Dynastic period
- 2494 BC -- End of Fourth Dynasty, start of Fifth Dynasty
- 2450 BC - End of the Early Dynastic IIIa Period and beginning of the Early Dynastic IIIb Period in Mesopotamia.
- Harappan civilisation, at its peak, covered an area of around 480,000 km². Its heartland lay in the Hakra river valley in Pakistan, but settlements spread as far as the Makran coast, Baluchistan, Afghanistan, eastern Punjab, Kutch and Saurashtra. They included cities like Harappa, Mohenjo-daro, Kalibangan, Dholavira, ports like Lothal, Sutkagen-dor and Sotka-koh and numerous villages as well.