Joshua 17:12, 16-18

But the descendants of Manasseh were unable to occupy these towns because the Canaanites were determined to stay in that region.

The descendants of Joseph responded, “It’s true that the hill country is not large enough for us. But all the Canaanites in the lowlands have iron chariots, both those in Beth-shan and its surrounding settlements and those in the valley of Jezreel. They are too strong for us.” Then Joshua said to the tribes of Ephraim and Manasseh, the descendants of Joseph, “Since you are so large and strong, you will be given more than one portion. The forests of the hill country will be yours as well. Clear as much of the land as you wish, and take possession of its farthest corners. And you will drive out the Canaanites from the valleys, too, even though they are strong and have iron chariots.”