Yellowstone National Park encompasses 2.2 million acres or 3,472 square miles. It is larger than the states of Delaware and Rhode Island combined and spreads across the borders of three states -Wyoming, Montana and Idaho. Three hundred fifty miles (564 km) of paved road wind through the park, crossing the Continental Divide three times. Elevations range from approximately 5,300 feet (1,608 m) at the North Entrance to almost 12,000 feet (3,640 m) at Eagle Peak on the park's east boundary; most roads lie at 7,500— 8,000 feet (2,275—2,427 m).

With so much to see and do, it's easy to be overwhelmed. Historically, visitors often referred to Yellowstone as "Wonderland," and that may be even more appropriate today. An unparalleled array of geothermal phenomena - geysers, hot springs, steam vents and mud pots - are preserved here, evidence of a volcanic past (and future?).The Grand Canyon of the Yellowstone is famous for its colors, shapes, and waterfalls (the Lower Falls, at 308 feet (103 m), is the highest in the park). The park shelters a variety and abundance of wildlife found in few other places. Yellowstone Lake and numerous rivers, streams, and waterfalls constitute a major Western water resource.

The park's major scenic attractions are located along the Grand Loop Road, the roughly figure eight shaped road in the center of the park. Actual driving time is difficult to estimate because the maximum speed limit is 45 mph (73 km per hour) or lower where posted, roads are narrow, winding, and full of pot holes and frost heaves, and traffic may be heavy and slow moving. While it is possible to drive the Grand Loop in a day, major attractions like Old Faithful Geyser and the Grand Canyon of the Yellowstone can only be seen by driving to a parking area and walking to the feature. If you have limited time, consider spending it at just one area instead of trying to"see the park" from the road. Many people believe that to fully appreciate just the major attractions in Yellowstone requires a minimum of three days.