What does Joshua 12:10 mean?

These are the kings of the land whom Joshua and the children of Israel struck beyond the Jordan westward, from Baal Gad in the valley of Lebanon even to Mount Halak, that goes up to Seir. Joshua gave it to the tribes of Israel for a possession according to their divisions;

in the hill country, and in the lowland, and in the Arabah, and in the slopes, and in the wilderness, and in the South; the Hittite, the Amorite, and the Canaanite, the Perizzite, the Hivite, and the Jebusite:

the king of Jericho, one; the king of Ai, which is beside Bethel, one;

the king of Jarmuth, one; the king of Lachish, one;

the king of Eglon, one; the king of Gezer, one;

the king of Debir, one; the king of Geder, one;