it left a place on which he built his own tomb, and two pyramids. One was erected for himself, the other for his wife. On these he placed stone statues of himself and his wife, sitting on thrones, in the impression that by means of this work he would be for ever held in grateful remembrance."[165] Of the lake above Memphis, Strabo gives the following account:--"The canton of the city Arsinoe, which was formerly known as the City of Crocodiles, surpasses all others in the beauty of its appearance, in fruitfulness, and also in the wonders to be seen there. It alone is covered with green and large olive trees, whereas there are no olives in the rest of Egypt; it produces a considerable amount of wine, and corn, and pulse, and many other cereals. In it also lies the wonderful lake of Moeris, which in size and colour is like a sea, and has shores like the shores of the sea. Owing to its size and depth this lake is able to receive the superfluous water at the time of the inundation, so that it does not overflow the inhabited and planted districts. On the other hand, when the river begins to subside, after it has poured the overflow into one of the two mouths of the canal, the lake and the canal together retain the water required for irrigation. This takes place in the natural course of things, but there are also artificial sluices at both mouths of the canal, by which the persons in charge regulate the rise and fall of the water." Tacitus also mentions "the excavated lake which receives the overflow of the Nile."[166] From these accounts the object of the work is clear. It was intended to regulate the inundation by a large reservoir, and so to increase its beneficent effects upon the soil of Egypt. The inundation was to be reduced for the Delta by drawing off a part of the water, which had risen into this basin in the neighbourhood of Memphis, in order that the land in this district might not be rendered swampy, and the marshes might have time to dry. This basin could also retain a portion of water in the superabundant years of excessive inundation, in order to supply the deficiencies of other years when the water did not reach the highest plots. Further, the reservoir might be used to irrigate the arable land in the neighbourhood during the waterless months, when there was no inundation.