The routes connecting the north of Syria with Asia Minor make use of these natural channels of approach. Thus the main road from Aintab northwards, after reaching the Pyramus near Marash, follows that river closely to Albistan, whence the bed of a stream leads up to the divide that gives way to the valley of the Tochma Su beyond. Derendeh is thus gained; and up this new valley the road passes by Gurun northward, and so over the watershed to Sivas in the valley of the Halys. From Albistan another route leads eastward to Malatia; and westward a path passing by Izgîn rises over the mountains to the interior.[6] A more direct route, however, from Aintab and Marash leads by the side of streams that feed the Pyramus north-westward up to Shahr (the classical Komana), on the sources of the Cilician Sarus; thence, by one of several passes, among which is the Kuru-Bel, the head-waters of the Zamanti Su are reached, so leading down to Cæsarea at the foot of Mount Argæus. The last-named river is tributary to the Sarus, passing by Ekrek, Tashji, and Fraktin on its course. It may be judged that a region so broken up by mountain-streams is not altogether barren or inclement. Its very altitude, averaging six thousand feet above the sea, gives respite from the summer heats that make life burdensome upon the Syrian plains. Green patches nestle under the shelter of its heights, protected thereby from the severity of winter blizzards when the mountain-passes may be filled with snow. And in its deeper valleys, though the actual banks are mostly rocky, yet the broad slopes on either side are generally favourable to the cultivation of cereals and other necessaries. The numerous fair towns that have sprung up in favoured spots, mostly upon Hittite sites, with their gardens and vineyards, fruit and olive plantations, their industries in weaving and embroideries, reveal to us something of its attractions and the possibilities of ancient settlement. Just as the roadways of this region converge upon Marash, so from this centre other lines of communication spread out into the regions of the south. On the one hand the valley of the Pyramus leads down to the Cilician plain; on the other the road to Aintab, which we now follow, brings us to the northernmost parts of Syria, historically the scene of the struggles of the Hittites with the Pharaohs and with Assyria. The whole tract before us as far southward as Aleppo is of twofold character: on the east are the great plains that lie away to the Euphrates, while on the west two mountain-ranges intervene between these and the sea, lying parallel with one another and with the coast.