'Hill country' in the Bible

And Abijah took up his position on Mount Zemaraim, in the hill-country of Ephraim, and said, Give ear to me, O Jeroboam and all Israel:

And Asa, hearing these words of Azariah, the son of Oded the prophet, took heart and put away all the disgusting things out of all the land of Judah and Benjamin, and out of the towns which he had taken from the hill-country of Ephraim; and he made new again the altar of the Lord in front of the covered way of the Lord's house.

And Jehoshaphat was living in Jerusalem; and he went out again among the people, from Beer-sheba to the hill-country of Ephraim, guiding them back to the Lord, the God of their fathers.

In addition, he made towns in the hill-country of Judah, and strong buildings and towers in the woodlands.