West of Worland and southwest of Greybull is the Fifteen Mile Unit. Wilderness Study Areas and BLM land has thousands of acres of public land. Low numbers of mule deer deer and a limited population of whitetail deer can be found in the area.

Mule deer numbers are low here, but can still be found. Since there are not a lot whitetails here either, it can be hard to find a mature buck.

Bighorn River runs along the eastern edge from Worland to Greybull. Buck Buttes, Tatman and Sheets Mountain all have high elevations. Bobcat Draw is a noted spot in the badlands. East Ridge and Dutch Nick Flat are two other topographical areas that can help define some parts of the unit. The badlands, ridges and drainages can make it hard for hunters to hike through.

Some irrigated crops near the Bighorn are the greenest spots in the area. Most of the unit is made up of buffalo, blue grama grasses and sagebrush rangelands. Junipers and shrubs can be seen on ridges and hillsides, with some cottonwood and willows found near the creek bottoms.

The majority of the unit is made up of BLM land and includes three Wilderness Study Areas; the Bobcat Draw Badlands, Sheep Mountain and Red Butte. All Wilderness Study Areas have been closed to all motorized use.

Hunters can camp on BLM land here. Worland and Greybull both have motels, restaurants, medical facilities and gas and diesel. Limited services can be found in Basin and Meeteetse.