The inhabitants affirm of this lake, that it has a subterraneous passage inclining inland towards the west, to the mountains above Memphis, where it discharges itself into the Libyan sands. I was anxious to know what became of the earth, which must somewhere have necessarily been heaped up in digging this lake; as my search after it was fruitless, I made inquiries concerning it of those who lived nearer the lake. I was the more willing to believe them, when they told me where it was carried, as I had before heard of a similar expedient used at Nineveh, an Assyrian city. Some robbers, who were solicitous to get possession of the immense treasures of Sardanapalus, King of Nineveh, which were deposited in subterraneous apartments, began from the place where they lived to dig under ground, in a direction towards them. Having taken the most accurate measurement, they continued their mine to the palace of the king; as night approached they regularly emptied the earth into the Tigris, which flows near Nineveh, and at length accomplished their purpose. A plan entirely similar was executed in Egypt, except that the work was here carried on not by night but by day; the Egyptians threw the earth into the Nile, as they dug it from the trench; thus it was regularly dispersed, and this, as they told me, was the process of the lake’s formation.[d] Thus Herodotus explains what he but faintly understood; his translator William Beloe has added the following commentary:[a] Herodotus, Diodorus, and Pomponius Mela differ but little in opinion concerning its extent. The design of it was probably to hinder the Nile from overflowing the country too much, which was effected by drawing off such a quantity of water, when it was apprehended that there might be an inundation sufficient to hurt the land. [The regulation of the Nile floods has been accomplished in the latter part of the nineteenth century, by dams elsewhere described.] The water, Pococke observes, is of a disagreeable muddy taste, and almost as salt as the sea, which quality it probably contracts from the nitre that is in the earth, and the salt which is every year left in the mud. The circumference of the lake at present is no more than fifty leagues. Larcher says we must distinguish betwixt the lake itself, and the canal of communication from the Nile; that the former was the work of nature, the latter of art. This canal, a most stupendous effort of art, is still entire; it is called Bahr Yusuf, the canal of Joseph. According to Savary it is forty leagues in length.