These ancient inhabitants engraved more than 20,000 symbols along a 2-mile expanse of basalt rocks. This ancient culture relied upon wild game and edible plants for subsistence and often reflected this in their etchings. However, many of these fascinating etchings are difficult to interpret, even to archeologists, and hold different meanings to each visitor. As you pass into the Three Rivers area you enter into many different ecozones. The famous petroglyph site is located in the rugged, rocky desert zone.
Plant life consists of mesquite bushes, cactus and lowland grasses.
The Three Rivers picnic and campground area offers an adventure into the desert. Overnight camping is permitted and the petroglyph site is handicapped accessible. There are RV hook-ups, restrooms and expanded camping and picnic areas.