Covering everything there is to know about the world's first and most diverse national park, this fourth edition of the bestselling guide to Yellowstone boasts more facts, anecdotes, history, and travel tips than ever before. Mile-by-mile road logs document every approach to the park and every interior road. Through easy-to-understand explanations and diagrams, readers will learn of Yellowstone's campgrounds and facilities, geyser basins and the frequency of the geysers, out-of-the-way hikes, and flora and fauna. Updates to this edition include tinted tabs to indicate the six different regions of the park and their approach roads, in addition to the tabs in previous editions for the geological, historical, and natural history sections; up-to-date scientific information to reflect recent research, including two new geological diagrams; highlighted historic items in the road logs; a dozen new pictures; and fully revised maps to show recent road changes and other details. A 20-page index rounds out this indispensable addition to any travel library.