Montana's Major Physical Features: Mountains, Rivers, Lakes, Glaciers

Montana's "Big Sky" landscape is defined by dramatic topography:

Mountains

• Rocky Mountains (western edge): Granite Peak (12,799 ft) in Beartooths — highest point.
• Cabinet Mountains (northwest): Rugged, glaciated; border Idaho/Canada.
• Bitterroot Range (west): Forms Idaho border; Selway-Bitterroot Wilderness.

Rivers

• Missouri River: Longest in MT; rises in Rockies, flows north/east to Mississippi.
• Yellowstone River: Longest undammed river in lower 48; through Yellowstone Park → Missouri.
• Clark Fork River: Bitterroots → Lake Pend Oreille (ID); Columbia tributary.

Lakes

• Flathead Lake: Largest natural freshwater lake in western US; recreation hub.
• Lake McDonald: Glacier NP's largest; crystal-clear, mountain-ringed.
• Lake Koocanusa: Reservoir on Kootenai River; MT/BC border.

Glaciers

• Concentrated in Glacier National Park (25+ active).
• Grinnell Glacier: Largest in park; Many Glacier area.
• Sperry Glacier: Notable ice caves; shrinking rapidly.

These features drive Montana's tourism, ecology, and identity.