The Blackfeet Indian Reservation or Blackfeet Nation is an Indian reservation of the Blackfeet tribe in the U.S. state of Montana, primarily made up of the Piegan Blackfeet branch. It is located east of Glacier National Park and borders the Canadian province of Alberta. Cut Bank Creek and Birch Creek make up part of its eastern and southern borders. The reservation contains 3,000 square miles (7,800 km²), half again the size of the national park and larger than the size of the state of Delaware.