Jabbok

The Jabbok is a stream east of the Jordan that scripture names as a boundary-line. In the UPDV passages that name it, the river functions as the edge of someone's territory: the limit of Sihon's Amorite kingdom, the river-border of the sons of Ammon, the northern reach of Israel's possession east of the Jordan, and the line allotted to Reuben and Gad.

The Northern Limit of Sihon's Amorite Kingdom

When Israel struck Sihon, the territory taken extended up to the Jabbok: "And Israel struck him with the edge of the sword, and possessed his land from the Arnon to the Jabbok, even to the sons of Ammon; for the border of the sons of Ammon was strong" (Nu 21:24). Joshua's later catalog of conquered kings restates the same span — Sihon "dwelt in Heshbon, and ruled from Aroer, which is on the edge of the valley of the Arnon, and [the city that is in] the middle of the valley, and half Gilead, even to the river Jabbok, the border of the sons of Ammon" (Jos 12:2). Jephthah's argument to the Ammonite king reaches the same point: "And they possessed all the border of the Amorites, from the Arnon even to the Jabbok, and from the wilderness even to the Jordan" (Jud 11:22). The Jabbok is, across these passages, the named upper edge of the Amorite-conquest territory.

The Border of the Sons of Ammon

The Jabbok is also the line Israel was forbidden to cross into Ammon. Moses recalls: "only to the land of the sons of Ammon you did not come near; all the side of the river Jabbok, and the cities of the hill-country, and wherever Yahweh our God forbade us" (De 2:37). The Ammonite king's later complaint to Jephthah's messengers reaches for the same span: "Because Israel took away my land, when he came up out of Egypt, from the Arnon even to the Jabbok, and to the Jordan: now therefore restore those [lands] again peacefully" (Jud 11:13). Whether described from the Israelite side as a Yahweh-forbidden frontier or from the Ammonite side as a contested span, the river Jabbok stands as the boundary marker between the two peoples.

The Allotment to Reuben and Gad

When Moses divided the eastern territory, the Jabbok formed the upstream edge of the Reubenite-Gadite allotment. "And to the Reubenites and to the Gadites I gave from Gilead even to the valley of the Arnon, the middle of the valley, and the border [of it], and to the river Jabbok, which is the border of the sons of Ammon" (De 3:16). The same line that bounded Sihon's kingdom and held back Israel from Ammon now defines the inheritance of the two-and-a-half tribes east of the Jordan.