'Regions' in the Bible

Turn [now] and {move on}, and go [into] the hill of the Amorites and to all [of] the neighboring regions in the Jordan {Valley} in the hill country and in the Negev and in the coastal area along the sea, [into] the land of the Canaanites and [into] the Lebanon, as far as the great river Euphrates.

All of these cities were fortified with high walls, gates, and bars. Furthermore, there were very many unwalled regions.

You are to determine the distances and divide the land the Lord your God is granting you as an inheritance into three regions, so that anyone who commits manslaughter can flee to these cities.