Semidi Wilderness
Before it became Wilderness or a subunit of the Alaska Peninsula Unit of the Alaska Maritime National Wildlife Refuge, these nine major treeless and ragged rock islands, some sided with precipitous cliffs, were combined with many small rocks and islets to form Semidi Islands National Wildlife Refuge in 1932. More than 2.4 million birds, almost half the breeding seabirds of the Alaska Peninsula Unit, nest on the Semidis. Aghiluk Island alone, the largest of the Semidis, is home to more than half a million birds. About 370,000 horned puffins nest in the Semidis along with almost all of the unit's northern fulmars and jaegers, and one million-plus murres. Ancient murrelets and parakeet auklets are among the other species found here.
Description from Wilderness Connect (wilderness.net).
| Designation | Wilderness |
| Managed by | U.S. Fish and Wildlife Service |
| State | Alaska |
| Size | 250,000 acres |
| Designated | 1980, by Congress |
| Center point | 56.10° N, 156.75° W |
| Night sky | About as dark as the ground gets (Black Marble reading 6) |
Boundary map
Boundary, simplified to about 0.005 degrees
The outline is the agency boundary simplified for display, so small parcels and inholdings may not show. The agency page has the authoritative map.
Where to camp
No federal campground is within ten miles of the boundary in the Campsite Atlas index. Camping inside a wilderness is usually allowed away from trails and water, with no facilities; the managing agency page has the permit and group-size rules.
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Reference
Questions people ask
How big is Semidi Wilderness?
250,000 acres.
Source: Wilderness Connect
Who manages Semidi Wilderness?
The U.S. Fish and Wildlife Service.
Source: Wilderness Connect
What state is Semidi Wilderness in?
Alaska.
Source: Wilderness Connect
When was Semidi Wilderness designated?
Congress designated it in 1980.
Source: Wilderness Connect
How do I get to Semidi Wilderness?
A point inside the boundary is at 56.100° N, 156.750° W. The official page carries directions and the office address.
Source: Wilderness Connect
Sources
- Boundary, name, acreage, designation year, states and description: Wilderness Connect.
- Campgrounds: the Campsite Atlas index of federal campgrounds, matched to this boundary at build time.
- Trailheads and sites: the Forest Service Recreation Opportunities layer, points inside the boundary.
- Night sky: NASA Black Marble (VIIRS, 2016 composite) sampled at zoom 6 around the center point.
- Weather, alerts, air quality, river flow and earthquakes load live in your browser from NWS, AirNow, USGS and iNaturalist when you open the page.