'Hill Country Of Ephraim' in the Bible

Abijah stood up on Mount Zemaraim, which is in the hill country of Ephraim, and said, "Hear me, Jeroboam and all Israel:

When Asa heard these words, and the prophecy of Oded the prophet, he took courage, and put away the abominations out of all the land of Judah and Benjamin, and out of the cities which he had taken from the hill country of Ephraim; and he renewed the altar of the LORD, that was before the porch of the LORD.

Jehoshaphat lived at Jerusalem: and he went out again among the people from Beersheba to the hill country of Ephraim, and brought them back to the LORD, the God of their fathers.