II. LANDS OF THE PLAIN. Of these, two are situated mainly between the Zagros chain of mountains and the Tigris river, Assyria and Elam; two are between the Tigris and Euphrates, Mesopotamia and Chaldea; and one is the vast Arabian desert. 1. =Assyria=, in the Hebrew everywhere Asshur, was properly the province now called _Kurdistan_, lying on the western slope of the Zagros Mountains, and extending across the Tigris to the Sinjar hills and the border of the Mesopotamian desert. The mountains separate it from Armenia; and the line of division from Elam, on the southeast, was near the place where the Tigris and Euphrates approach nearest before their separation. The land was occupied by people of various races, of which the Semitic were predominant. The earliest city was at Asshur, supposed to be _Kileh Sherghat_, where a dynasty of kings began to rule about 1800 B.C., while the Israelite tribes were in Egypt. The seat of government was afterward transferred to Calah, or Halah (_Nimrud_), north of Asshur; and finally a permanent location of the capital was made at Nineveh, which became the centre of the great Assyrian empire. This will be described more fully with the map of that empire, on page 91. The Assyrian kingdom was long in its duration, but passed through many vicissitudes, several times ruling all the lands of the Euphrates, and again, in a feeble condition. Its principal cities, besides Nineveh, were Calah, Resen (which may have been at _Selamiyeh_, three miles south of Nineveh), and Rehoboth. There is reason to believe that all the four cities named in Gen. 10:11, 12, were combined in the walls of Nineveh. 2. =Elam=, called Susiana by the Greeks, lay southeast of Assyria and west of Persia Proper, between the Zagros chain of mountains and the Tigris river. It included both a mountainous and a lowland tract, the latter very fertile. Shushan (Susa), the capital of the Persian empire, lay within this province, and was its principal city. The earliest conqueror named in the Bible, Amraphel, was the king of Elam, and held dominion over most of the lands as far west as Canaan. (See the map of his empire, on page 34.) This kingdom was not of long continuance as an independent state, but soon fell under the power of Assyria, though maintaining its own organization as a vassal state until the Persian period, when it became a province of the empire.