Turtle Mountain, or the Turtle Mountains, is an area in central North America, in the north-central portion of the U.S. state of North Dakota and southwestern portion of the Canadian province of Manitoba, approximately 100 km south of the city of Brandon on provincial highway 10. It is a plateau 2,000 ft (600 m) above sea level, 300 ft to 400 ft (90 m to 120 m) above the surrounding countryside, extending 20 mi (32 km) from north to south and 40 mi (64 km) from east to west.