It divides into two branches, which cross almost at right angles.

One branch turns to the south-east, while the other, which again divides into secondary branches, turns to the south-west.

Westward rises a mountain which recalls upon a gigantic scale the outline of the great step-pyramid of Sakkarah (fig.

137).

The Egyptian engineers of the time observed that this hollow was separated from the ravine of Amenhotep III.