Route: Achenbach Trail (ND)

This route encompasses a large swath of wilderness in the North Unit of Theodore Roosevelt National Park. https://www.nps.gov/thro/planyourvisit/maps.htm  Steep climbs and descents between river valley and butte plataeus plus two river crossings make this a challenging and interesting trail. Along the way you might see prairie dogs, elk, mule deer, pronghorn, bighorn sheep, and of course bison. The presence of bison can make a large impact on your trail experience, as you may need to reroute around bison on the trail. Since bison frequently follow and cross the trail, it is easy to accidentally follow their paths which are often wider than the trail itself.