Albert Barnes Commentary Ezekiel 47:18

"And the east side, between Hauran and Damascus and Gilead, and the land of Israel, shall be the Jordan; from the [north] border unto the east sea shall ye measure. This is the east side." — Ezekiel 47:18 (ASV)

The eastern boundary is to commence by separating the territory of Damascus and Hauran, and then to follow the line of the Jordan to the Dead Sea. Further, the land occupied by the trans-Jordanic tribes was also to be separated from the land of Israel. The trans-Jordanic tribes in fact occupied their ground (in Joshua’s allotment) on sufferance. This land did not belong to Canaan proper, the land of promise. Hence, the tribes formerly on the east of the Jordan have allotments here in Canaan, though “the oblation” (Ezekiel 45:1) extends a considerable distance beyond the Jordan (see Plan, Ezekiel 48). The whole arrangement being ideal and symbolic, the vision here, as in the case of “the waters” (Ezekiel 47:1, see note), departs from the physical features of the land for the purpose of maintaining symbolic numbers.