Ancient CivilizationsThe Discovery of Eridu, Sumer’s Jewel and the World’s Oldest City Posted on May 3, 2025 by Administrator In the arid desert of southern Iraq, the remains of one of the world’s oldest cities can be found. This is Eridu, created by the gods as the starting point of civilization in Sumerian mythology. For over two thousand years, this incredibly ancient site (the city was founded in 5,400 BC) lay untouched, its significance long forgotten.