In the valley were Beth Haram, Beth Nimrah, Succoth, and Zaphon. The Jordan was the line to the low end of the Sea of Chinnereth, east of the Jordan ️.
and in the valley, Beth-haram, Beth-nimrah, Succoth, and Zaphon, with the rest of the kingdom of Sihon king of Heshbon (the territory on the east side of the Jordan up to the edge of the Sea of Chinnereth).
KJV
And in the valley, Betharam, and Bethnimrah, and Succoth, and Zaphon, the rest of the kingdom of Sihon king of Heshbon, Jordan and [his] border, [even] unto the edge of the sea of Chinnereth on the other side Jordan eastward.
ASV
and in the valley, Beth-haram, and Beth-nimrah, and Succoth, and Zaphon, the rest of the kingdom of Sihon king of Heshbon, the Jordan and the border thereof, unto the uttermost part of the sea of Chinnereth beyond the Jordan eastward.