Fausset's Bible Dictionary
Connected with Nebo and Pisgah in Deuteronomy 32:49; Deuteronomy 34:1. Abarim was probably the mountain chain, Nebo one mountain of it, and Pisgah the highest peak of Nebo. Peor also belonged to the range. The chain east of the Dead Sea and lower Jordan commands most extensive views of the country west of the river. It was from Pisgah that Moses took his view of the promised land just before he died.
Some identify mount Attarous, the loftiest hill in this region, ten miles north of the river Arnon, with Nebo. Its top is marked by a pistachio tree overshadowing a heap of stones. The Hebrew means "the mountains of the regions beyond," namely, the Jordan, or else "the mountains of the passages." They were in the land of Moab, opposite Jericho. Compare Numbers 27:12; Numbers 33:47-48; Deuteronomy 3:27. Dr. Tristram verified the observation of the landscape from Nebo, as seen by Moses according to the Scripture record. There is one isolated cone commanding a view of the valley where Israel's battle was fought with Amalek, which may be the Pisgah of holy writ.
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Fausset, Andrew R. Entry for 'Abarim'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/a/abarim.html. 1949.