the border between Moab and the Amorites, Num 21:13 , and the city that is in the midst of the river; or "even the city"; meaning the same city of Aroer, it lying both on the bank of it, and in the middle of it, or it was a double city, as may seem from Isa 17:2 ; and so differently situated at that river: and all the plains of Medeba unto Dibon; of these two places, see Num 21:30 ; between them lay a plain, which some take to be the plain of Moab; but it rather seems to be a plain that was between these two places, and, according to Jos 13:17 , Dibon itself was in a plain.