If one could only ascertain at what point in the course of the river 3 the rise begins, the causes of the rise would also be discovered. As it is, the river wanders through great deserts, spreads out into marshes, among many scattered tribes, before it is for the first time after its wandering, mazy course gathered into one near Philae. Philae is a rugged island, precipitous on all sides; it is surrounded by the two branches of the river before they unite to form the one river which henceforth bears the designation Nile. The whole city of Philae is surrounded by the Nile, which after leaving Ethiopia is a large rather than rapid river.[64] Next in its course are the sandy deserts through which passes the trade route to the Red Sea.[64] After that 4 the Nile enters the Cataracts, a spot famous for a wonderful sight. The river rises over high crags that are at several points jagged. The opposing rocks break up its course and rouse its utmost force; as it struggles through the narrows, swirls show the points where it conquers or is conquered. A smooth channel had hitherto conducted its waters without uproar. Here for the first time they are roused, and the turbulent cataract leaps down through the narrow passage quite unlike its former self. Up to that point the stream was thick and muddy. 5 But once it enters the craggy gorge it breaks into foam. Its colour is no longer the natural one, but derived from the ground through which it has to force its way. When at length it has struggled through the obstructions, suddenly deprived of support, it falls from a vast height with a roar that resounds through all the surrounding regions. The race planted in that savage place was indeed unable to endure the din; their ears were deafened by the constant crash, and they were therefore removed from the settlement. [64] The text is very uncertain. Among the wonderful sights of the river I have been told of a feat of incredible daring performed by the inhabitants. Two of them embark in a small boat, one steering, the other baling out the water. Forthwith they are violently buffeted from side to side by the furious waves of 6 the rapid river, and at length reach the narrowest channels, through which they thread their way till they escape from the craggy gorge. Then they are carried down along with the whole volume of the stream, guiding all the time by hand the rushing craft. At one moment they seem to stand right on their head; the spectators are in great alarm; one gives them up for lost, and believes they must be sunk and overwhelmed by such a mass of water. But finally they are shot out like an arrow, and are discovered afloat at a point far below where they had entered the current. The waves in their fall do not swamp them, but pass them on to smooth water.