Chief Mountain (Blackfoot: Ninaistako) (9,085 feet (2,769 m)) is located in the U.S. state of Montana on the eastern border of Glacier National Park and the Blackfeet Indian Reservation.

[6][5] The peak is easily seen from Montana and Alberta due to the rapid 5,000-foot (1,500 m) altitude gain over the Great Plains which are immediately east of the mountain.

The mountain was seen by white explorers in the late 18th century and was known as "Kings Peak" on maps produced in the United Kingdom in 1795.

[5] Natives from all over North America travel to the base of the mountain for sweet grass ceremonies, placing of prayer flags and other religious rites.

Upon the summit, Stimson's party observed ceremonial remains including bison skulls that had been left behind by Native Americans.