These cities and towns strategically lay on an east-west line, running from the Jordan to the Mediterranean coast, and overlooking the fertile Jezreel Valley. Whoever held these towns could effectively cut northern Israel in two and maintain a stranglehold on agricultural and trading activity over a wide area. They were too important to leave unchallenged…. As border towns four of them posed a direct threat to Manasseh itself, as well as to its northern neighbors.
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27 Manasseh did not drive out the inhabitants of Beth-shean and its villages, or Taanach and its villages, or the inhabitants of Dor and its villages, or the inhabitants of Ibleam and its villages, or the inhabitants of Megiddo and its villages, for the Canaanites persisted in dwelling in that land.