Largest Mountain Chain in US & Canada: Rocky Mountains (US) & Canadian Rockies

The Rocky Mountains are the largest mountain chain in the United States — and the Canadian Rockies are the largest in Canada. They are the same continental system.

🇺🇸 United States: The Rocky Mountains

• Length: ~3,000+ miles (4,800+ km) — longest in North America
• Span: Northern New Mexico → Wyoming → Montana → Idaho → Canada
• Highest peak: Mount Elbert, CO — 14,440 ft (4,401 m)
• Subranges: Front Range, Sawatch, Sangre de Cristo, Teton, Wind River, Bitterroot, Cabinet, etc.
• Continental Divide runs along crest — Atlantic vs Pacific drainage

🇨🇦 Canada: The Canadian Rockies

• Sub-range of the Rockies — British Columbia & Alberta
• Length: ~900 mi (1,450 km) — shorter but more dramatic relief
• Highest peak: Mount Robson — 12,972 ft (3,954 m)
• Iconic parks: Banff, Jasper, Yoho, Kootenay — UNESCO World Heritage
• Geology: Thrust-faulted sedimentary layers — sheer walls, turquoise lakes (Louise, Moraine)

🔗 One System, Two Names

• Geologically continuous — Laramide orogeny (80–55 Ma)
• Border at 49th parallel — political, not geological
• Together: North American Cordillera — includes Coast Mountains, Sierra Nevada, etc.

⛰️ Other Major US Chains (for context)

• Appalachians: Older, eroded, 1,500 mi — East
• Sierra Nevada: 400 mi, high, granitic — CA/NV
• Cascades: Volcanic, 700 mi — WA/OR/CA
• Brooks Range: Arctic Alaska — 700 mi

The Rockies: backbone of the continent, shared by two nations.