These are the words that Moses spoke to all Israel beyond the Jordan—in the wilderness, on the plain opposite Suph, between Paran and Tophel, Laban, Hazeroth, and Di-zahab.
(By the way of Mount Seir it takes eleven days to reach Kadesh-barnea from Horeb.)
In the fortieth year, on the first day of the eleventh month, Moses spoke to the Israelites just as the Lord had commanded him to speak to them.
This was after he had defeated King Sihon of the Amorites, who reigned in Heshbon, and King Og of Bashan, who reigned in Ashtaroth and in Edrei.
References for Deuteronomy 1:4
Beyond the Jordan in the land of Moab, Moses undertook to expound this law as follows:
The Lord our God spoke to us at Horeb, saying, "You have stayed long enough at this mountain.