Labels:earth | geological formation | hollow | rock | sky OCR: Old Faithful Geyser About Yellowstone Natl.Park The 2,200,000- acre (898,000- hec t tare} park is the nation's first and largest national park, as well a.s the largest wildlife preserve in the United States Yellowstone's landscape, with its canyons, lakes and waterfalls was shaped by the action f volcanoes and glaci ers. The park gre test attractions are its 10,000 geysers, many f which erupt to heights of 100 feet (30 m) or more Geyer Yellowston greatest attract tions