c. 2500 BC: People in Peru rely on fish and mussels for food.
c. 2500 BC: Evidence of long-distance trade routes in South America.[1]
c. 2500 BC: Skara Brae is abandoned after approximately 600 years of occupation.
c. 2500–2250 BC: Ebla tablets are collected in the ancient city of Ebla, Syria. Discovered by Italian archaeologist Paolo Matthiae and his team in 1974–75, is considered to be the first, if not the oldest, inactive library being the St. Catherine's Monastery Library (565) the oldest active one.
c. 2500–2000 BC: Mohenjo-daro is about 7 square miles (18 km2) in size and has a population of c. 20,000 to 50,000.
The Indus Valley civilisation, at its peak, covered an area of around 480,000 km2 (185,000 sq mi), an area just over half the size of present-day Pakistan. Its heartland lay in the Indus River in Pakistan, but settlements spread as far as the Makran coast, Balochistan, Afghanistan, eastern Punjab, Kutch and Saurashtra. They included cities like Harappa, Mohenjo-daro, Kalibangan, Dholavira, ports like Lothal, Sutkagen-dor and Sokhta Koh and numerous villages as well. They used irrigation to farm and constructed cities. The two main cities had sewage systems, bronze, trade tokens (early coins), and hieroglyphs. There were even baths at one of the villages, besides the great baths of brick in each city.
Sahure is the earliest known king to make use of a high-seas navy to transport troops over the sea.
The earliest known example of a sewn boat is constructed in Egypt.