Sumer
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Sumer was an ancient civilization located in the southern part of Mesopotamia (modern day southeastern Iraq). This civilization came into being about 3500 BC. Sumer civilisation grew on the fertile banks of river Tigris and Euphrates, which drain into the Persian Gulf. Sumerian culture is famous for their written script - in which letters were formed by pressing a triangle shaped reed into wet-clay tiles. They are also credited for dividing a day into 24 hours and each hour into 60 minutes.
The Sumerian communities were organised in city states, each ruled by a priest or king. The most famous Sumerian city was Ur.
The Sumerians disappeared (lost their own identity) in about 2000 BC because a large group of different people, the Amorites, moved into their region and also because they were having problems farming because there was too much salt in their land.
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