")These nomadic Chaldeans settled in the far southeastern portion of Babylonia, chiefly on the left bank of the Euphrates.Though for a short time the name commonly referred to the whole of southern Mesopotamia in Hebraic literature, this was a geographical and historical misnomer as Chaldea proper was in fact only the plain in the far southeast formed by the deposits of the Euphrates and the Tigris, extending about four hundred miles along the course of these rivers and averaging about a hundred miles in width.