The children of Joseph said, The hill-country is not enough for us: and all the Canaanites who dwell in the land of the valley have chariots of iron, both they who are in Beth-shean and its towns, and they who are in the valley of Jezreel.
Although the Joseph tribes received the best part of Canaan, they were still not satisfied. They wanted more land, but they did not want to work for it or fight for it. Joshua told them that if they cleared the forests and drove out the Canaanites, they would find that they had plenty of land within the territory already allotted to them (14-18).