Joshua 13:25 Midrash

וַיְהִ֤י לָהֶם֙ הַגְּב֔וּל יַעְזֵר֙ וְכָל־עָרֵ֣י הַגִּלְעָ֔ד וַחֲצִ֕י אֶ֖רֶץ בְּנֵ֣י עַמּ֑וֹן עַד־עֲרוֹעֵ֕ר אֲשֶׁ֖ר עַל־פְּנֵ֥י רַבָּֽה׃

And their border was Jazer, and all the cities of Gilead, and half the land of the children of Ammon, unto Aroer that is before Rabbah;