Stephen Mather Wilderness
It is located within North Cascades National Park , Lake Chelan National Recreation Area , and Ross Lake National Recreation Area in the North Cascade Range of Washington , United States . 
<triplet> North Cascades National Park <subj> North Cascade Range <obj> mountain range <triplet> Lake Chelan National Recreation Area <subj> North Cascades National Park <obj> located in protected area <triplet> North Cascade Range <subj> Washington <obj> located in the administrative territorial entity