אַרְנוֹן ʼArnôwn (H769)

the Arnon, a river east of the Jordan, also its territory

Arnon = "rushing stream" 1) a river and surrounding valley in south Palestine, forms the border between Moab and the Amorites

or אַרְנֹן; from רָנַן (H7442); a brawling stream;