'Hill country' in the Bible

And Abijah stood up upon Mount Zemaraim, which is in the hill country of Ephraim, - and said, Hear me, O Jeroboam and all Israel!

And, when Asa heard these words and the prophecy of Oded the prophet, he strengthened himself, and put away the abominations out of all the land of Judah and Benjamin, and out of the cities which he had captured out of the hill country of Ephraim, - and renewed the altar of Yahweh, that was before the porch of Yahweh.

So Jehoshaphat dwelt in Jerusalem, - and he again went forth among the people, from Beersheba as far as the hill country of Ephraim, and brought them back unto Yahweh, the God of their fathers.

Cities also, built he, in the hill country of Judah, - and, in the thick woods, built he fortresses and towers.