After the winter crops are harvested in the spring, it appears to be the general practice for the cultivators to pay special attention to their water-supply. The retaining banks are cut and the water allowed to drain off at the lowest level possible, the wells being sometimes left in this condition for several months, so that they gradually clean themselves with a minimum of trouble to their owners. The mud, exposed on the sides of the basin, continually slides downwards into the central pool, and is carried away in suspension by the outflowing water.
Drift sand has been very destructive in the neighbourhood of Maks Bahari. At Ain Bella, 2½ kilometres to the N.N.W., there are at present only a few acres under cultivation, but the tract anciently tilled is seen in the eroded remnants of an alluvial platform to the north and north-east; this is now a deeply-grooved and ridged hummocky area of loam, full of dead palm-stubs, with rootlets ramifying in every direction. The original terrace appears to have extended far to the north, the portion now remaining being composed of alternating layers of sand and clay, dipping steeply to the south. At the present day many of the cultivated terraces are not only being gradually raised by the continual deposition of wind-borne materials, but are being extended horizontally, owing to the constant additions of layers of sand and clay-dust to the steeply-inclined southern or lee faces. In many respects the growth of these terraces is analogous to that of sand-dunes, though, unlike the latter, the northern portions of the terraces are practically stationary.
At one time or another many wells existed to the west, but are now buried in the dunes, their former presence being testified by isolated exposures of arable land and by occasional trees and bushes. The dunes, following their natural S.S.E. course in the direction of the prevailing winds, seem to be still encroaching on the belt of country occupied by the existing wells and cultivated lands, and it is probably only a matter of time, perhaps a few hundred years, before they blot out the whole of the south part of the oasis. The sand speedily envelops any settlements which are abandoned, as nothing encourages the formation of dunes to such an extent as vegetation, and this nearly always abounds in the neighbourhood of the wells.
There is little to commend itself to notice at Maks Qibli, the southern of the two hamlets of the same name; there are scattered doums, several groves of date-palms, and small patches of cultivation irrigated by isolated wells, all on high ground. Here, as elsewhere in this part of the country, much land has gone out of cultivation, though it must be mentioned that the villagers are rather progressive in planting trees and maintaining small vegetable gardens.
Dush lies out of the main line of villages, being 10 kilometres east of Maks Qibli, not far from the eastern wall of the oasis. It is a pretty little place, with small clumps of palms, and two white Sheikhs’ tombs on the north side. Ain el Burrda, the big well immediately alongside the village, ceased flowing about three years ago, to the great grief of the inhabitants, who now have to carry their water from Ain el Karm, itself barely running. Fortunately, the great Ain Johar, situated to the south but irrigating land to the north, continues to discharge with unabated vigour. More conspicuous than the village is the ancient Qasr Dush, occupying the summit of a small hill to the east. This will be noticed later.
DUSH VILLAGE.
The wells attached to the hamlets of Dush and Maks mark the limits of the oasis to the south. The most southerly running well of any importance is Ain el Qasr, though Ain Zaha el Din, still farther to the south, just trickles, and irrigates a tiny area of not more than a few square metres. Ain Mabrûka, a kilometre south of the last-mentioned well, is overgrown with green weed, and surrounded by a patch of tamarisk, short prickly scrub, and two or three wild palms. This is the most southerly point at which exposed water is to be seen, though in the midst of a large area of scrub still farther to the south a sanded-up well of the name of Ain el Terfai is reported to exist.
The scrub-covered area of Ain el Terfai is about 25 kilometres south of Beris. To the south the surface gradually rises, and is absolutely devoid of vegetation, the oasis-depression having given way to the true desert. The next available water is at a place called Nakhail, 60 kilometres to the S.S.E.; the water there is good, but only exists in small quantities, obtainable in one or two spots by digging to a depth of a couple of metres.