East, by the Western Slope of the Rocky Mountains; This contours along the Continental Divide, an imaginary line that marks the flow of precipitation. Rain falling on the west of the Divide makes its way to the Pacific Ocean. Rain on the east makes its way to the Gulf of Mexico and the Atlantic Ocean.
South, The southern borders of Mesa, Pitkin and Summit Counties. This is an arbitrary line 50 to 100 miles south of the east-west running Interstate 70, stretching roughly from the western portal of the Eisenhower Tunnel in the east to the Utah state line in the west.
Region boundaries in Colorado tend to be somewhat controversial (even in day-to-day life in the state) and are done in an ad-hoc way here. If you're expecting to read about some destination in this article and can't find it, check in the neighboring Front Range, Southwestern Colorado, and even South Central Colorado sections to see if it's covered there.
The Most Frequently Asked Travel Questions about Northwestern Colorado
Where To Stay & Best Hotels in Northwestern Colorado - updated May 2024
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Northwestern Colorado Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.
