The North Cascades have long been known as the North American Alps. Characterized by rugged beauty, this steep mountain range is filled with jagged peaks, deep valleys, cascading waterfalls and glaciers. North Cascades National Park Service Complex contains the heart of this mountainous region in three park units which are all managed as one and include North Cascades National Park, Ross Lake and Lake Chelan National Recreation Areas. Each area offers different experiences and contains wilderness. Over 93% of the park complex is managed as the Stephen T. Mather Wilderness, named in honor of the first director of the National Park Service. Leashed pets are allowed in developed areas, such as picnic areas, parking lots, and along gravel and paved roads. Leashed pets are allowed in Ross Lake and Lake Chelan National Recreational Areas and along the Pacific Crest Trail. Leashed pets are allowed in developed areas of the National Forest, except on Mountain Trail 681 in Heather Meadows Area. Pets are not allowed in the buildings. Leashes must be no longer than six feet.