"Yellowstone National Park is often referred to as "the heard of the Rocky Mountains" ; encompasing 3,472 square miles, and lying in northwestern Wyoming, with narrow areas extending into eastern Idaho and southern Montana, it is the largest, oldest, and probably best-known national park in the United States. It is more than 10,000 thermal features, including thousands of hot springs and over 200 true geysers (more geysers than the sum of those in all other parts of the world), make it by far the most significant and spectacular thermal area on earth. Yellowstone is a wild, mysterious monutain plateau with natural curiosities, varying from delicately hued, constantly changing, placid pools and finely scuptured, travertine-ornamented hillsies to thundering, foaming cataracts and mammoth, bold-colored canyons. Its wild animal and bird life is varied, abundant, and magnificent, its plant life breathtaking."--Page 10.