'Mountains of Ephraim' in the Bible

And Abijah stood up upon mount Zemaraim, which is in the mountains of Ephraim, and said, Hear me, you Jeroboam, and all Israel;

And when Asa heard these words, and the prophecy of Oded the prophet, he took courage, and put away the abominable idols out of all the land of Judah and Benjamin, and out of the cities which he had taken in the mountains of Ephraim, and repaired the altar of the LORD, that was before the vestibule of the LORD.