John Gill Commentary Deuteronomy 1:7

"turn you, and take your journey, and go to the hill-country of the Amorites, and unto all [the places] nigh thereunto, in the Arabah, in the hill-country, and in the lowland, and in the South, and by the sea-shore, the land of the Canaanites, and Lebanon, as far as the great river, the river Euphrates." — Deuteronomy 1:7 (ASV)

Turn you and take your journey
That is, remove from Horeb, where they were, and proceed on in their journey, in which they had been stopped almost a year:

and go to the mount of the Amorites ;
where they and the Amalekites dwelt, in the south part of the land of Canaan, and which was the way the spies were sent, (Numbers 13:17Numbers 13:29) (Numbers 14:40Numbers 14:43) ,

and unto all the places nigh thereunto ;
nigh to the mountain. The Targum of Jonathan and Jarchi interpret them of Moab, Ammon, Gebal, or Mount Seir: "in the plain, in the hills, and in the vale"; such was the country near this mountain, consisting of champaign land, hills, and valleys:

and in the south ;
the southern border of the land of Canaan, as what follows describes the other borders of it:

and by the sea side :
the Mediterranean sea, the western border of the land, which Jarchi out of Siphri explains of Ashkelon, Gaza, and Caesarea, and so the Targum of Jonathan:

into the land of the Canaanites ;
which was then possessed by them, the boundaries of which to the south and west are before given, and next follow those to the north and east:

and unto Lebanon ;
which was on the north of the land of Canaan:

unto the great river, the river Euphrates ;
which was the utmost extent of the land eastward, and was either promised, as it was to Abraham, (Genesis 15:18) or enjoyed, as it was by Solomon, (1 Kings 4:21) .