Nimrod's kingdom in Shinar
Nimrod, a grandson of Ham, became the first great ruler after the Flood, with cities in Shinar and Assyria.
The beginning of his kingdom was Babel, Erech, Accad, and Calneh, in the land of Shinar.
Genesis 10:10 (World English Bible)
Genesis calls Nimrod “a mighty one on the earth” and names Babel, Erech, Accad, and Calneh as the start of his kingdom. He then built Nineveh and other cities in Assyria.
Because Babel heads his list, many see Nimrod as the leader behind the tower project, though Genesis 11 doesn't name him.
Places
AssyriaNinevehShinarBabelCalahErechAccadCalnehRehoboth-IrResen
Dating notes
Approximate. Genesis ties Nimrod to the Babel era; Ussher discusses Nimrod under 2234 BC (Annals §50). His birth and death years are not recorded.