The northern part of the range, north of Mount Rainier, is known as the North Cascades in the United States but is formally named the Cascade Mountains north of the CanadaâUnited States border, reaching to the northern extremity of the Cascades at Lytton Mountain.
The perimeter of Washington Park in Denver, CO is about 2.60 miles.
The park is 140 miles south of Denver. It has sand dunes up to 750 feet tall, the highest in North America. The dunes cover about 30 square miles, and the park itself contains 235 square miles. (TM and Â© Copyright 2015 CBS Radio Inc. and its relevant subsidiaries.