Sedanka Island (Aleut: Sidaanax̂) is an island in the Fox Islands group of the eastern Aleutian Islands, Alaska. It is 10.3 miles (16.6 km) long and is situated off the northeast coast of Unalaska Island. It has a land area of 39.889 square miles (103.31 km2) and no permanent population.
- Sedanka Island: Block 2001, Census Tract 2, Aleutians West Census Area, Alaska United States Census Bureau
- Bergsland, K. (1994). Aleut Dictionary. Fairbanks: Alaska Native Language Center.
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