South east of the mountains lie steppe and desert with oases such as the saltpan of Jebeil in the north, Kinnesrin and Aleppo, and Sham or Damascus fed by streams from HermOn of which Barada (anc. Abana) and Acwaj (anc. Pharpar) are the chief. Farther south occur some large masses of tertiary lava of which El Leja (also called Trachon) is the chief. Marine Pliocene beds have been found at El Forklus in the Palmyra desert. To the west of the mountain ridges lies the coastal plain. It is very narrow in the south from Tyre (Es Sur) to Tripoli, but widens out in the north especially near the river mouths. The coast (with the exception of the delta sections) shows marked north to south lines. These seem related structurally to the great north to south faults among the mountains.
The few indentations of the coastline limit the natural harbours, but where local circumstances have been favourable (e.g., a small island off Tyre and a small promontory near Beirut) some of the great harbours of the ancient world grew up. On this coast, it was said, the east and west met. Thus behind the mountains were the great bazaars—Damascus, Antioch, Awa and Aleppo—and on the coast the great ports, Tyre, Sidon, Acre, Beirut, Tripoli, Latakia and Alexandretta.
Climate.—The coastal strip of Syria has the best climate, because it is exposed to the moderating influences of the Medi terranean. The westerly rain-bearing cyclonic storms bring rain in winter to this part which has the heaviest fall in the south (Beirut 21.66 in. mean annual rainfall). Among the mountains of Lebanon the rainfall often exceeds 4o inches. The coast lands are also less affected by intense heat, owing to the sea influences, the mean annual temperature at Beirut being 68°. Where the cooling sea winds are shut off by the mountains, as at Aleppo and Damascus, the heat is intense. In winter the dense, cold, dry anticyclonic influences of central Asia spread over the plateau regions of Syria, giving frost and snow among the mountains; but this is never experienced along the coast. The interior steppe gives great contrasts of temperature both seasonal and diurnal, although the rainfall is always slight. In early summer a hot, dry wind, often bringing large quantities of sand, blows out from the desert and often damages the vegetation of the coastal regions. These general climatic conditions mean that Syria, except the narrow littoral strip, which was the ancient Phoenicia, and the small deltas, such as that of Latakia (Laodicea), is not highly productive without irrigation. The larger rivers (e.g., the Orontes) flow in deep beds and are thus of little use for irriga tion purposes. Mid-Syria, except for the lacustrine oases, is a region mainly occupied by pastures and yielding only thin cereal crops. The plains south and south-east of Aleppo have a little spring rain giving a good spring pasture which has attracted the nomads from farther south. Below the latitude of Raqqa-Homs thin steppe begins, and quickly degenerates into desert broken only by a chain of poor oases, south of a low ridge running from Anti-Lebanon to Euphrates. Of these the principal are Karietein
and Tadmor (Palmyra), through which passes the trade from Damascus to the east.