'Hill country' in the Bible

And these are their names: ... the son of Hur in the hill country of Ephraim;

And, hearing of it, Jeroboam, the son of Nebat, who was still in Egypt, where he had gone in flight from Solomon, and was living there, came back to his town Zeredah, in the hill-country of Ephraim;

Then Jeroboam made the town of Shechem in the hill-country of Ephraim a strong place, and was living there; and from there he went out and did the same to Penuel.