Watson's Biblical & Theological Dictionary
or Babylonia, the country lying on both sides of the Euphrates, of which Babylon was the capital; and extending southward to the Persian Gulf, and northward into Mesopotamia, at least as far as Ur, which is called Ur of the Chaldees. This country had also the name of Shinar. See.
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Watson, Richard. Entry for 'Chaldea'. Richard Watson's Biblical & Theological Dictionary. https://www.studylight.org/dictionaries/eng/wtd/c/chaldea.html. 1831-2.