Stjernøya is an island in western
Finnmark county,
Norway, sitting at the mouth of the
Altafjorden on the south side of the
Sørøysundet strait. It is divided among the municipalities of
Loppa,
Hasvik, and
Alta. The highest point on the island is the mountain Kjerringfjordfjellet at above sea level. One of the larger fjords on the island is the
Sørfjorden. There are very few residents on the mountainous island. The main population area is at Store Kvalfjord on the northeastern side of the island. On the southern part of the island there is a large
Nepheline syenite mine at
Lillebukt. The island is separated from the mainland by the strait of
Stjernsundet.
