And from the plain. There is no "from" in the original, which here ceases to describe the territories of Sihon, but continues the account of the Israelite dominions, which included the Arabah (not the plain as in our version) up to the sea of Chinneroth.
On the east; i.e; the east of Jordan. So also below. The way to Beth-jeshimoth (see Numbers 33:48, Numbers 33:49). There was a desert tract near the Dead Sea called Jeshimon, or the waste district. It is described by travellers as the most arid portion of the whole land.
In this, Beth-jeshimoth (the house of desolations) was situated. It was south of the acacia meadows (see note on Joshua 2:1), and it formed part of the territory of Reuben (Joshua 13:20). As it lay upon Jordan, it must have been near the extreme northernmost point of the Dead Sea.
We are to understand, not that Sihon's territory extended to Beth-jeshimoth, but in that direction. Possibly some of the western Cauaanitish tribes here extended their territories across the Jordan. And from the south.
The word here is not Negeb, but Teman, i.e; the literal south, which lay on the right ( יָמִין) to one looking eastward. Ashdoth-pisgah. For Ashdoth see Joshua 10:40. Pisgah was the northernmost point of the Abarim range, of which the well.
known Nebo was the chief peak. Thither Moses went up to view the land which he was not permitted to enter. There Balaam built his seven altars and essayed in vain to curse the children of Israel. There were the watchmen (Zophim) stationed to protect the land, in the days before the Israelitish invasion, from the incursions of the tribes on the other side of Jordan (Numbers 23:14).
The position of Pisgah has not been precisely identified, but the range extended on the eastern side of Jordan to a point nearly opposite Jericho. See Deuteronomy 34:1.