The Muddy River watershed covers over 1,700 square miles in southeastern Nevada and has a unique geologic history that is showcased in the area's "Entry Walls." These towering walls of rock, which are up to 80 feet high, were formed as the result of a process called "undercutting erosion," in which the river slowly eroded the softer layers of rock beneath harder, more resistant layers. Over time, this created the distinctive walls that can be seen today.

The Entry Walls are a popular destination for hikers and nature enthusiasts, as well as geologists interested in the unique geologic formations. Visitors can hike along the Muddy River and see the Entry Walls up close, or take in the stunning views from the surrounding hills and mountains. Along the way, they may also see a variety of wildlife, including desert bighorn sheep, coyotes, and a variety of bird species. Additionally, the area is home to numerous archaeological sites, including petroglyphs and other rock art, that offer a glimpse into the region's rich cultural history. Overall, the Entry Walls are a must-see destination for anyone interested in the natural beauty and geologic history of the American Southwest.