Cape Sarichef Light is a lighthouse located on the northwest tip of Unimak Island, approximately 630 miles (1,010 km) southwest of Anchorage, Alaska.

The most westerly and most isolated lighthouse in North America, Cape Sarichef Light marks the northwest end of Unimak Pass, the main passage through the Aleutian Islands between the Bering Sea and the Pacific Ocean.

From August 1912 to June 1913, the lighthouse received no supplies at all; the nearest neighbor was a trapper some 10 miles (16 km) away.

[5] The upgrade included a LORAN radiobeacon to help ships and aircraft obtain an accurate position.

Relations between the two services were reportedly very good, with a lot of swapping of everything from food to vehicle parts.