God instructed Moses to ascend Mount Nebo in the Abarim range and view the land promised to Israel. Moses was told that he would see the land but would not enter it because of the events at the waters of Meribah.
Deuteronomy 34 records Moses ascending from the plains of Moab to Mount Nebo, to the top of Pisgah opposite Jericho. From there God showed him the land extending across the Jordan.
Moses died in the land of Moab and was buried in a valley there, but Scripture states that the location of his grave was not known.
Mount Nebo therefore marks the conclusion of Moses' leadership and the transition to Joshua, who would lead Israel across the Jordan.