'Hill Country Of Ephraim' in the Bible

There was a certain man of Ramathaim-zophim, of the hill country of Ephraim, named Elkanah the son of Jeroham, the son of Elihu, the son of Tohu, the son of Zuph, an Ephraimite.

And they passed through the hill country of Ephraim and the land of Shalishah, but did not find them. Then they passed through the land of Shaalim, but they were not there and the land of the Benjamites, but they [still] did not find them.

When all the men of Israel who had hidden themselves in the hill country of Ephraim heard that the Philistines had fled, they too pursued them closely in the battle.