The Blue John Canyon
system is extensive, with one main branch and several tributaries, forming a number of distinct sections of narrows, the best being the upper main fork which forms a one mile slot, easily explored from the lower end. Further downstream, the drainage eventually meets Horseshoe Canyon
, part of which is contained in a detached section of Canyonlands National Park, and shares part of the same access route, though with a 31 mile drive on dirt roads, not so many people explore this region. Passageways in the main fork are fairly straight and angular, and the rocks are dark in color. The east fork contains a longer slot, more difficult to follow.
: Close to Burr Pass, 31 miles on dirt roads from Hwy 24 - details