Amphitheater Mountain (8,690 feet (2,649 m)) is located in the Lewis Range, Glacier National Park in the U.S. state of Montana. Amphitheater Mountain is a descriptive name given to the peak because of its resemblance to the Greek Amphitheater. The mountain's Blackfoot name is Three Horns or Niuóxkai-ozkina for a Blackfoot warrior who captured a Nez Perce woman as was able to live happily ever after.