Civilisation can only begin when there is enough prosperity to provide a surplus of produce to divert after providing subsistence. The river valleys were fertile and well watered enough to produce this surplus.
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The river was a convenient source of fresh water, and if deep enough, a means of using boats to transport goods and people.
Mummy
rhombus
Around 10th century BC.
Circa the 8th century CE
It was a celebration in honour of the god Zeus, held at his temple in Olympus.