Joshua 13:9

from Aroer, that is upon the bank of the river Arnon, and the city that is in the midst of the river and all the plain of Medeba unto Dibon;

Numbers 21:30

And Heshbon destroyed their kingdom even unto Dibon, and we have laid them waste even unto Nophah and Medeba.

Joshua 13:16

and their border was from Aroer, that is on the bank of the river Arnon, and the city that is in the midst of the river and all the plain until Medeba,

Deuteronomy 3:12

And this land, which we inherited at that time, from Aroer, which is by the river Arnon, and half of Mount Gilead and the cities thereof, I gave unto the Reubenites and to the Gadites.

Deuteronomy 3:16

And unto the Reubenites and unto the Gadites I gave from Gilead even unto the river Arnon, half the valley for a border even unto the river Jabbok, which is the border of the sons of Ammon,

Joshua 12:2

Sihon, king of the Amorites, who dwelt in Heshbon, and ruled from Aroer, which is upon the bank of the river Arnon, and from the midst of the river and from half of Gilead, even unto the river Jabbok, which is the border of the sons of Ammon,

Isaiah 15:2

He is gone up to Bajith and to Dibon, the altars, to weep; Moab shall howl over Nebo and over Medeba: every head among her shall become bald, and every beard shall be cut off.

Jeremiah 48:18

Thou daughter that dost inhabit Dibon, come down from thy glory, and sit in thirst; for the spoiler of Moab has come against thee and has dissipated thy strong holds.

Jeremiah 48:22

and upon Dibon, and upon Nebo, and upon Bethdiblathaim,

Treasury of Scripture Knowledge

Summary

From Aroer, that is upon the bank of the river Arnon, and the city that is in the midst of the river, and all the plain of Medeba unto Dibon;

Bible References

All the plain

Numbers 21:30
And Heshbon destroyed their kingdom even unto Dibon, and we have laid them waste even unto Nophah and Medeba.
Isaiah 15:2
He is gone up to Bajith and to Dibon, the altars, to weep; Moab shall howl over Nebo and over Medeba: every head among her shall become bald, and every beard shall be cut off.
Jeremiah 48:18
Thou daughter that dost inhabit Dibon, come down from thy glory, and sit in thirst; for the spoiler of Moab has come against thee and has dissipated thy strong holds.

General references

Numbers 21:31
Thus Israel dwelt in the land of the Amorite.
Numbers 34:14
because the tribe of the sons of Reuben, according to the houses of their fathers, and the tribe of the sons of Gad, according to the houses of their fathers, and half the tribe of Manasseh have received their inheritance.
Joshua 13:16
and their border was from Aroer, that is on the bank of the river Arnon, and the city that is in the midst of the river and all the plain until Medeba,
Judges 11:19
And Israel sent messengers unto Sihon, king of the Amorites, the king of Heshbon; and Israel said unto him, Let us pass, we pray thee, through thy land into my place.