Smith’s Bible Dictionary

Calah

(completion, old age), one of the most ancient cities of Assyria. (Genesis 10:11) The site of Calah is probably market by the Nimrud ruins. If this be regarded as ascertained, Calah must be considered to have been at one time (about B.C. 930-720) the capital of the empire.

Smith’s Bible Dictionary, William Smith (1863). Public domain, from the CrossWire SWORD module.