Yellowstone Insider Your Complete Guide to America's First National Park

Giant Geyser is the central geyser of the Giant Group, which includes Mastiff Geyser and Bijou Geyser. In a “normal function eruption,” only Giant erupts, which means it will usually be shorter in terms of time and plume size, attaining 150 feet. Meanwhile, during a “Mastiff function eruption,” where Mastiff erupts alongside Giant (and sometimes Bijou), making Giant rocket upwards of 250 feet. Giant Geyser has had a long history of amazing visitors and explorers alike—not only for the size of its eruptions, but also for its marvelous geyserite cone. The quick sketch above, done by Walter Trumbell of the ...

After years of study and maneuvering through red tape at the federal and state levels, the first transfer of quarantined Yellowstone bison to the Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation in Poplar, Montana is now in the books.