Both Sumeria and Egypt were surrounded by water, deserts, and mountains. Sumer was surrounded by mountains and the Arabian desert on three sides and the Persian Gulf on the fourth side. Egypt was surrounded by deserts on two sides and the Mediterranean Sea on one side. The easiest way for invaders to approach both civilizations was through the river valley that led to them. This was the Nile valley for Egypt and the Tigris valley for Sumer.
Sumerians and Egyptians both constructed elaborate buildings for religious purposes, but