#3 threefold division

Such is the twofold division of the country which impresses the observer strongly at the first. On a longer sojourn and a more intimate familiarity, the twofold division gives place to one which is threefold. The lower differs from the upper valley, it is a sort of debatable region, half plain, half vale; the cultivable surface spreads itself out more widely, the enclosing hills recede into the distance; above all, to the middle tract belongs the open space of the Fayoum nearly fifty miles across in its greatest diameter, and containing an area of four hundred square miles. Hence, with some of the occupants of Egypt a triple division has been preferred to a twofold one, the Greeks interposing the "Heptanomis" between the Thebais and the Delta, and the Arabs the "Vostani" between the Said and the Bahari, or "country of the sea."