What does Genesis 10:19 mean?
This verse defines, in loose geographical descriptions, the approximate borders of the land occupied by the Canaanites. The description of this territory will become important later in Israel's history. God will give the region of the Canaanites to the people of Israel. It will become the Promised Land (Exodus 3:17), and Israel will move into it, conquer its peoples, and take possession of the land and its cities.Some of the Canaanite clans listed in the previous verses will be wiped out; others will become servants to God's people Israel. This is partly due to the curse Noah levied against Canaan in Genesis 9:20–25. It is also due to the extraordinary evil which Canaan's descendants participated in (Deuteronomy 9:3–6).
Sodom and Gomorrah will become so well known for their wickedness that their names will become shorthand for depraved evil. God's judgment on them is described in Genesis 19.