'Hill country' in the Bible

These were their names:Ben-hur, in the hill country of Ephraim;

Jeroboam built Shechem in the hill country of Ephraim and lived there. From there he went out and built Penuel.

Now the king of Aram’s servants said to him, “Their gods are gods of the hill country. That’s why they were stronger than we were. Instead, we should fight with them on the plain; then we will certainly be stronger than they will be.