History thumb|left|Painted pottery vessel from Eridu (Tell Abu Shahrain), Iraq. 3500-2800 BCE. Iraq Museum, Baghdad Eridu is one of the earliest settlements in the region, founded during the early Ubaid period, at that time close to the Persian Gulf near the mouth of the Euphrates, although in modern times it is about 90 miles inland. Excavation has shown that the city was founded on a virgin sand dune site with no previous habitation. According to the excavators, construction of the Ur III ziggurat and associated buildings was preceded by the destruction of preceding construction and its use as leveling fill so no remains from that time were found. At a small mound 1 kilometer north of Eridu two Early Dynastic III palaces were found, with an enclosure wall. The palaces measured 45 meters by 65 meters with 2.6 meter wide walls and were constructed in the standard Early Dynastic period method of plano-convex bricks laid in a herringbone fashion.
History thumb|left|Painted pottery vessel from Eridu (Tell Abu Shahrain), Iraq. 3500-2800 BCE. Iraq Museum, Baghdad Eridu is one of the earliest settlements in the region, founded during the early Ubaid period, at that time. close to the Persian Gulf near the mouth of the Euphrates, although in modern times it is about 90 miles inland. Excavation has shown that the city was founded on a virgin sand dune site with no previous habitation. According to the excavators, construction of the Ur III ziggurat and associated buildings was preceded by the destruction of preceding construction and its use as leveling fill so no remains from that time were found. At a small mound 1 kilometer north of Eridu two Early Dynastic III palaces were found, with an enclosure wall. The palaces measured 45 meters by 65 meters with 2.6 meter wide walls and were constructed in the standard Early Dynastic period method of plano-convex bricks laid in a herringbone fashion.