“the land that remains.” This is the land that remains to be conquered. This needs to be clear because some of the territory they did conquer they did not yet occupy, and in the years it was empty the Canaanites resettled it and it had to be reconquered.
all the regions of the Philistines and all the Geshurites. The next verses that speak of the land left to conquer are mainly speaking of the coastal areas of Israel, but in this verse the area of the Philistines and the area of the Geshurites are not close together. The Philistines are on the southern coast of Israel, while Geshur is quite a bit north of the Sea of Galilee. This is the first mention of the Philistines in the Book of Joshua. The Philistines descended from Ham via Mizraim, Canaan’s brother.