Stephen Mather Wilderness

Stephen Mather Wilderness
IUCN category Ib (wilderness area)[1]
Little Beaver Valley
Location	Whatcom / Chelan / Skagit counties, Washington, USA
Nearest city	Marblemount, Washington
Coordinates	48°39′0″N 121°08′0″W / 48.65000°N 121.13333°W / 48.65000; -121.13333
Area	634,614 acres (256,819 ha)
Established	1988
Governing body	National Park Service

The Stephen Mather Wilderness is a 634,614 acres (256,819 ha) wilderness area honoring Stephen Mather, the first director of the National Park Service. 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.

It is bordered by the Pasayten Wilderness to the northeast, the Mount Baker Wilderness to the northwest, the Noisy-Diobsud Wilderness to the west, the Glacier Peak Wilderness to the southwest, and the Lake Chelan-Sawtooth Wilderness to the southeast.^[2]

The North Cascades National Park Complex consists of three units which make up Stephen Mather Wilderness: 505,000-acre (204,366 ha) North Cascades National Park, which boasts 504,614 acres (204,210 ha) acres of designated wilderness; 117,600-acre (47,591 ha) Ross Lake National Recreation Area, a slim piece of land just east of the park that has 74,000 acres (29,947 ha) acres of designated wilderness; and 62,000-acre (25,091 ha) Lake Chelan National Recreation Area, at the southeast corner of the park, with 56,000 acres (22,662 ha) of designated wilderness.^[2]