The highest peak in the Ox Mountains is
Knockalongy, which is high. , the range's highest peak The mountains begin immediately southwest of
Ballysadare, and run west-southwest for some forty miles to the boundary of
County Mayo, where they are continued to the southwest by the Slieve Gamph range, which runs first on the boundary of the two counties, and then into Mayo. The mountains have several summits from 1,200 to 1,800 feet high; and Slieve Gamph reaches 1,363 feet. ==Geology==