No trip to Yellowstone is complete without a journey to Old Faithful. Not only is it the most famous geyser in America, the name denotes a vast hydrothermal area. The Old Faithful area of Yellowstone National Park encompasses three geyser basins - Upper, Lower and Midway basins - stretched along the Firehole River. It boasts the highest concentration of geysers in the world. More than 200 of these spectacular features are found here! And it is home to six geysers with predicted eruptions. Grand, Castle, Daisy, Great Fountain, Riverside and Old Faithful spout almost as if on cue. The Old Faithful district of Yellowstone isn't called Geyser Country for nothing.