'Hills' in the Bible

The servants of the king of Syria said to him, "Their god is a god of the hills; therefore they were stronger than we. But let us fight against them in the plain, and surely we shall be stronger than they.

A man of God came near and spoke to the king of Israel, and said, "Thus says Yahweh, 'Because the Syrians have said, "Yahweh is a god of the hills, but he is not a god of the valleys;" therefore I will deliver all this great multitude into your hand, and you shall know that I am Yahweh.'"