The Boston Mountains is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma.

The ecoregion is steeper than the adjacent Springfield Plateau to the north, and bordered on the south by the Arkansas Valley.

Maximum elevations are higher, soils have a warmer temperature regime, and carbonate rocks are much less extensive than in the Ozark Highlands.

[5] The sandstone beds become thinner with higher shale content in the west as the mountains decline in elevation.

Turner Ward Knob (TWK) is the second highest named peak, 2.2 miles (3.5 km) east of Wahzhazhe Summit.

[8] The other three highest peaks are located 4–5 miles (6.4–8.0 km) south-southwest of Turner Ward Knob along Arkansas Highway 16.

In Arkansas, the Boston Mountains are found in the following counties: Boone, Carroll, Cleburne, Conway, Crawford, Franklin, Independence, Johnson, Madison, Newton, Pope, Searcy, Stone, Van Buren, and Washington.

In Oklahoma, the Boston Mountains are found in these counties: Adair, Cherokee, Muskogee, Sequoyah, and Wagoner.