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Kitto's Popular Cyclopedia of Biblial Literature
Ar´non, a river forming the southern boundary of trans-Jordanic Palestine, and separating it from the land of Moab (Numbers 21:13; Numbers 21:26; Deuteronomy 2:24; Deuteronomy 3:8; Deuteronomy 3:16; Joshua 12:1; Isaiah 16:2; Jeremiah 48:20). It now bears the name of Wady Modjeb, and rises in the mountains of Gilead, near Katrane, whence it pursues a circuitous course of about eighty miles to the Dead Sea. It flows in a rocky bed, and, at the part visited by Burckhardt, in a channel so deep and precipitous as to appear inaccessible; yet along this, winding among huge fragments of rock, lies the most frequented road, and, not being far from Dibon, probably that taken by the Israelites. The stream is almost dried up in summer; but huge masses of rock, torn from the banks, and deposited high above the usual channel, evince its fulness and impetuosity in the rainy season.
Kitto, John, ed. Entry for 'Arnon'. "Kitto's Popular Cyclopedia of Biblial Literature". https://www.studylight.org/encyclopedias/eng/kbe/a/arnon.html.