Numbers 21:13
From thence they removed, and pitched on the other side of Arnon, which in the wilderness that cometh out of the coasts of the Amorites: for Arnon the border of Moab, between Moab and the Amorites.
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Context
11 And they journeyed from Oboth, and pitched at Ijeabarim, in the wilderness which before Moab, toward the sunrising.
12 From thence they removed, and pitched in the valley of Zared.
13 From thence they removed, and pitched on the other side of Arnon, which in the wilderness that cometh out of the coasts of the Amorites: for Arnon the border of Moab, between Moab and the Amorites.
14 therefore it is said in the book of the wars of the Yahuah, What he did in the Red sea, and in the brooks of Arnon,
15 And at the stream of the brooks that goeth down to the dwelling of Ar, and lieth upon the border of Moab.