Montana ( ) is a state in the Western United States. One-third of the state in the western part contains numerous mountain ranges (approximately 77 named) of the northern Rocky Mountains; thus the state's name, derived from the Spanish word montaña 'mountain.' The state nickname is the "Treasure State." Other nicknames include "Land of Shining Mountains", "Big Sky Country", and the slogan "the last best place". The state ranks fourth in area, but 44th in population, and therefore has the third lowest population density in the United States. The economy is primarily based on ranching and wheat farming in the east, lumber and tourism in the west, oil and coal in the east, and hard rock mining in the west. Millions of tourists annually visit Glacier National Park, the Battle of Little Bighorn site, and three of the five entrances to Yellowstone National Park.

Geography

The topography of the state is diverse, but roughly defined by the Continental Divide, which runs on an approximate diagonal through the state from northwest to south-central, splitting it into two distinct eastern and western regions. Montana is well known for its mountainous western region, part of the northern Rocky Mountains. However, about 60% of the state is actually prairie, part of the northern Great Plains. Nonetheless, even east of the Continental Divide and the Rocky Mountain Front, there are a number of isolated "Island Ranges" that dot the prairie landscape.

The Bitterroot Mountains divide the state from Idaho to the west with the southern third of the range blending into the Continental Divide. Mountain ranges between the Bitterroots and the top of the Continental Divide include the Cabinet Mountains, the Missions, the Garnet, Sapphire, Flint Creek, and Pintlar ranges.

The northern section of the Divide, where the mountains give way rapidly to prairie, is known collectively as the Rocky Mountain Front and is most pronounced in the Lewis Range located primarily in Glacier National Park. Due to the configuration of mountain ranges in Glacier National Park, the Northern Divide (which begins in Alaska's Seward Peninsula) crosses this region and turns east in Montana at Triple Divide Peak. Thus, the Waterton, Belly, and Saint Mary rivers flow north into Alberta, Canada, joining the Saskatchewan River and ultimately emptying into Hudson Bay.

East of the Divide, several parallel ranges march across the southern half of the state, including the Gravelly Range, the Tobacco Roots, the Madison Range, Gallatin Range, Big Belt Mountains, Bridger Mountains, Absaroka Mountains, and the Beartooth Mountains. The Beartooth Plateau is the largest continuous land mass over 10,000 feet (3,000 m) in the lower 48 states and contains the highest point in the state, Granite Peak, 12,799 feet (3,901 m) high.