Mahogany Mountain
 Mahogany Mountain is an ancient caldera volcano on the border of Oregon and Idaho in Malheur County and Owyhee County respectively. While its early history is largely unknown its last eruption was probably 15.5 million years ago. This eruption ejected layers of rhyolite and produced tuff creating formations of rock in the Leslie Gulch. Nearby features include the Owyhee River historically used as a fishing and camping ground for early Native Americans.