Boston Mountains, most rugged part of the Ozarks, NW Ark. and E Okla., rising to 2,700 ft (823 m). Isolated because of its geographical makeup, the region developed its own lifestyle; mountain people occupy small farms, cultivating the narrow valleys and living on the ridges. The Boston Mts., along with the rest of the highlands, have become a popular recreation center. Ozark National Forest is there.