Concise Bible Dictionary:

One of the ancient cities in the land of Shinar built by Nimrod (Gen. 10:1010And the beginning of his kingdom was Babel, and Erech, and Accad, and Calneh, in the land of Shinar. (Genesis 10:10); Amos 6:22Pass ye unto Calneh, and see; and from thence go ye to Hamath the great: then go down to Gath of the Philistines: be they better than these kingdoms? or their border greater than your border? (Amos 6:2)). Some identify it with Ctesiphon beyond the Tigris; others with Niffer, about 60 miles E. S. E.; but on the maps it is usually placed at 32° 10' N, 45° 5' E, not coinciding with either of these.

Jackson’s Dictionary of Scripture Proper Names:

the wail is complete