Located in northwestern Colorado, the Mantle Ranch is a private pristine ranch surrounded by the 225,000 acre Dinosaur National Monument. A treasured and rare inholding, the Mantle Ranch is an ecological, cultural and geological jewel located in an astonishingly beautiful and serene river corridor with thousand foot high yellow and red sandstone canyon walls carved by the wild and free flowing Yampa River. The land is beautiful, secluded, historic and replete with recreational and cultural resources including petroglyphs, and other ancient Native American art, fossils, trophy elk and mule deer hunting, and Colorado white water adventures.