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While Montana’s total population may add up to less than 1 percent of the entire United States, it easily claims the title of the fourth largest state when it comes to land (it clocks in at a whopping 145,552 acres). With that much terrain under its belt, it’s no surprise that Montana’s … more topography is incredibly diverse. The western half of the state is endowed with the Rocky Mountains and spans the Continental Divide. The eastern half is mostly prairie land, broken up by rivers, lakes, and a smattering of mountains. Montana’s largest cities lie along the Missouri River, which runs the length of the state from northeast to southwest, the Yellowstone River (to the south), and the Clark Fork River (in the northwest). Glacier National Park spills into Canada from the northwestern corner of the state, while the entrance to Yellowstone National Park rests on Montana’s southern border with Wyoming.