Boyd’s Bible Dictionary:

(dark blue). The great river of Egypt, worshipped as a god, famous for its annual and fertilizing overflows and its many mouths. Name not mentioned in scripture, but alluded to as “the river” (Gen. 41:1; Ex. 2:3; 7:21); “the river of Egypt” (Gen. 15:18); “flood of Egypt” (Amos 8:8); Sihor, “black” (Josh. 13:3); Shihor, “dark blue” (1 Chron. 13:5); Nachal of Egypt,” “river of Cush.”

Concise Bible Dictionary:


From Manners and Customs of the Bible:

Exodus 7:21. The fish that was in the river died; and the river stank, and the Egyptians could not drink of the water of the river.
The extent of this calamity will be seen when it is remembered that the waters of the Nile were to the Egyptians then, as now, the great source of dependence for drinking and for culinary purposes. The spring water is hard and unwholesome, wells are seldom found, and rain water cannot be collected because it hardly ever rains. The inhabitants are therefore driven to the river, which all travelers agree in saying furnishes as sweet and wholesome water as can be found in the world. It is at first very thick and muddy, but can be readily filtered. The Egyptians say that “Nile-water is as sweet as honey and sugar.” Great indeed must have been the misfortune when this universal supply of one of the greatest necessaries of life was cut off.

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