Rich Mountain is the second highest point of the U.S. Interior Highlands and Ouachita Mountains, and in the U.S. state of Arkansas; it is also the site of Queen Wilhelmina State Park. Rich Mountain is a long, generally east–west-trending ridge composed of hard sandstone. It is located just outside of Mena, Arkansas and is intersected by the Arkansas-Oklah…Rich Mountain is the second highest point of the U.S. Interior Highlands and Ouachita Mountains, and in the U.S. state of Arkansas; it is also the site of Queen Wilhelmina State Park. Rich Mountain is a long, generally east–west-trending ridge composed of hard sandstone. It is located just outside of Mena, Arkansas and is intersected by the Arkansas-Oklahoma border. Atop its summit is the Rich Mountain Lookout Tower, which is approximately 2.4 mi east-southeast of the Queen Wilhelmina Lodge.