Isaiah 23:3

The seed of Sihor "The seed of the Nile" - The Nile is called here Shichor, as it is Jeremiah 2:18, and 1 Chronicles 13:5. It had this name from the blackness of its waters, charged with the mud which it brings down from Ethiopia when it overflows, Et viridem Aegyptum nigra fecundat arena; as it was called by the Greeks Melas, and by the Latins Melo, for the same reason. See Servius on the above line of Virgil, Georg. 4:291. It was called Siris by the Ethiopians, by some supposed to be the same with Shichor. Egypt by its extraordinary fertility, caused by the overflowing of the Nile supplied the neighboring nations with corn, by which branch of trade the Tyrians gained great wealth.

And by great waters - That is, by the abundant-waters, or the overflowing of the Nile. Tyre was the mart to which the superabundant productions of Egypt were borne (see Ezekiel 27)

The seed of Sihor - There can be no doubt that by 'Sihor' here is meant the river Nile in Egypt (see Joshua 13:3; 1 Chronicles 13:5; Jeremiah 2:18). The word שׁחר shichor is derived from שׁחר shachar, "to be black" Job 30:30, and is given to the Nile from its color when it brings down the slime or mud by which Egypt is rendered so fertile. The Greeks gave to the river the name Μέλας Melas ("black"), and the Latins call it "Melo" - (Serv. ad Virg. "Geor." iv. 291. It was called "Siris" by the Ethiopians; perhaps the same as Sihor. The upper branches of the Nile in Abyssinia all receive their names from the "color" of the water, and are called the White River, the Blue River, etc.

The harvest of the river - The productions caused by the overflowing of the river. Egypt was celebrated for producing grain, and Rome and Greece derived no small part of their supplies from that fertile country. It is also evident that the inhabitants of Palestine were early accustomed to go to Egypt in time of scarcity for supplies of grain (see Genesis 37:25, Genesis 37:28, and the history of Joseph, Genesis 41-43) That the "Tyrians" traded with Egypt is also well known. Herodotus (ii. 112) mentions one entire quarter of the city of Memphis that was inhabited by the Tyrians.

Is her revenue - Her resources are brought from thence.

She is a mart of nations - How true this was, see Ezekiel 27. No place was more favorably situated for commerce; and she had engrossed the trade nearly of all the world.