Deuteronomy 3:16-17 -

The possession of the tribes of Reuben and Gad is here more exactly defined. Its southern boundary was the middle of the valley (the wady) of the Arnon; half the valley, and the border , i . e . the middle of the ravine (or wady) and its edge; a more precise definition of the river Arnon ; the brook which flowed through the middle of the ravine was to be their boundary line to the south. On the northeast the Upper Jabbok ( Nahr Amman ) was to be their boundary; this separated them from Ammonitis, the region of the children of Ammon ( Numbers 21:24 ). On the west the 'Arabah ( Ghor ), and the Jordan and its border (its east bank), from Chinnereth (Kinnereth), a fenced city by the sea of Galilee, thence called "the sea of Chinnereth" ( Numbers 34:11 ; Joshua 12:3 ; Joshua 19:35 ), to the sea of the 'Arabah, the salt sea, under Ashdoth-pisgah —the slopes (literally, the outpourings , the place where the mountain torrents flow out, hence the base of the hill) of Pisgah ( Numbers 21:15 ; Numbers 27:12 )— eastward ; i . e . simply the east side of the 'Arabah and the Jordan.