The Three Rivers Petroglyphs are outstanding examples of prehistoric Jornada Mogollon rock art. The basaltic ridge rising above the Three Rivers Valley contains over 21,000 petroglyphs, including masks, sunbursts, wildlife, handprints, and geometric designs. The number and concentration of petroglyphs make this one of the largest and most interesting rock art sites in the Southwest. A rugged 0.5-mile trail begins at the visitor shelter and links many of the most interesting petroglyphs. Another short trail begins on the east side of the picnic area and leads to a partially excavated prehistoric village.