Keyhole Sink is a small keyhole-shaped canyon east of Williams, Arizona, in the Kaibab National Forest, known for seasonal waterfalls and for petroglyphs carved into volcanic basalt by the ancient Cohonina people about 700 to 1100 CE. Archaeological evidence indicates it was probably not a large settlement but a sacred stopping place for hunters and a site for clan initiations, with pit house remains found within about fifteen miles. Its rock art includes snakes, lizards, deer, and abstract forms. Though later restored, the petroglyphs still bear traces of major vandalism from August 2010, highlighting both their fragility and archaeological significance.