Located entirely in northern Arizona, the park encompasses 277 miles of the Colorado River and adjacent uplands. One of the most spectacular examples of erosion anywhere in the world, Grand Canyon is unmatched in the incomparable vistas it offers to visitors on the rim. Grand Canyon National Park is a World Heritage Site. Expect crowds during the spring, summer, and fall months. During these months reservations for camping and lodging are essential. When visiting the South Rim, be sure to go to Canyon View Information Plaza, there you will find information to help plan your Grand Canyon visit.