ancient region along the lower courses of the Tigris and Euphrates rivers: S part of Babylonia
Babylonia: so called during Chaldean supremacy, c. 6th cent.
See Chaldea in American Heritage Dictionary 4
or Chal·dae·a
An ancient region of southern Mesopotamia. Settled c. 1000 B.C., it reached the height of its power under Nebuchadnezzar II. The Chaldean empire was destroyed by Persians in 539 B.C.