Northwestern Colorado is a region of the state of Colorado in the United States of America. It is primarily a region of high mesas with a number of points of scenic, geological and archaeological interest, but its eastern edge extends to the Rockies and the region includes such famous destinations as the great ski resort at Vail.
Broadly, this region is bounded on the:
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.
Although there are some famous mountain attractions along the eastern side of the region, most of the area is dominated by high canyon/mesa country rather than by towering summits. A geological formation characteristic of, and widespread in, the region is the Book Cliffs that are shown to good advantage around Grand Junction. A side effect of this geology is that the region is famous for its fossils. Dinosaur National Monument, along the Utah state line and extending into that state, was formed to preserve the enormous fossil beds found there, which are still yielding remarkable paleontological discoveries. There is also an interesting paleontological museum in Grand Junction.