Diodorus tells us that king Moeris erected the north gateway at Memphis, the splendour of which excelled all others; and above the city at about ten schoenes distance he excavated a lake of marvellous utility and incredible size. The circuit was 3,600 stades, and the depth in most places was fifty fathoms. "Who would not ask, when contemplating the vast extent of this work, how many myriads of men were required to complete it, and for how many years? But no one could ever speak in worthy terms of the utility of the lake and the advantage it is to the inhabitants of Egypt and the wise prudence of the king in making it. As the Nile does not rise evenly, and the fruitfulness of the land depends on the evenness of the overflow, Moeris excavated this lake to receive the superfluous water, in order that an excessive inundation might not create marshes and morasses, or a deficiency of water imperil the fruitfulness of the soil. He carried a canal 300 feet in breadth from the river for eighty stades (about ten miles) to the lake, through which he first admitted the superfluous water and then drew it off. In this way he procured for the tillers of the soil the desired medium in the water, since the mouth of the canal was sometimes closed, sometimes opened, which was both a difficult and costly thing to do. The lake has remained to our time, and is still called by the name of the constructor, the lake of Moeris. In the middle, the king who excavated 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]