Buckskin Gulch is the longest, deepest slot canyon in the Southwest (and probably the world) – a 23-mil gash carved through the desert. High sandstone walls and a narrow, twisting corridor create a wonderland environment with stupendous plays of sunlight throughout. It can be a short hike out of Wire Pass, or a serious multi-day hike. Some scrambling, canyoneering, and water passages put this on top of many hikers’ must-do list.