This week's showcase is brought to you by Visit Southeast Montana, and takes us to the southeastern border of Montana just 10 minutes outside of Decker, to Tongue River State Park. A 265-mile-long tributary of the Yellowstone River, “the Tongue” (as it is called locally) starts in Wyoming and runs through Montana.

The park features a 12-mile long reservoir set in scenic prairie and bluff lands of southeastern Montana, which is characterized by the striking contrast of red shale and juniper canyons. Due to the rareness of large bodies of water like this in this part of the state, the par...