Numbers 34:15

The two tribes and the half tribe
The tribes of Reuben and Gad, and the half tribe of Manasseh:

have received their inheritance on this side Jordan near Jericho,
eastward, toward the sun rising;
that is, they received the grant of it there, even in the plains of Moab, opposite Jericho, which lay to the east of the land of Canaan.