Bluff Springs is located off Rio Penasco Road off the highway to Sunspot. This travertine cliff is the result of hundreds of years worth of heavily mineral-laden water dripping and flowing over the side of the hill. All of the plants on the cliff and in the foreground are the rare Sacramento Thistles. Most of the flowers had quit blooming, but I found a few across the road that still had flowers on them. The land near the bluff is fenced off to protect the plants.