John Gill's  Exposition of the Bible 

Deuteronomy 3:29

So we abode in the valley over against Bethpeor.

So we abode in the valley over against Bethpeor. In the plains of Moab, over against a temple built for Baalpeor upon a mountain, so called from that idol, or that idol from the mountain; this is the valley where Moses was buried, Deuteronomy 34:6.