Fosnøyna or
Fosnøy is an
island in the municipality of
Austrheim in
Hordaland county,
Norway. The island makes up the majority of the land area of the municipality. The island is located east of the
Fedjefjorden and south of the
Fensfjorden. The island of
Radøy lies just south of Fosnøyna and the mainland of the
Lindås peninsula lies immediately to the east of Fosnøyna. The highest point on the island is the high Bredvikvarden. The island has some trees on it, but the northern part is fairly barren and rocky while the southern part is more marshy. There are two larger villages on the island: the village of
Austrheim and the municipal centre of
Årås. The island is connected to the mainland road network by two bridges. A series of small bridges connects Fosnøyna to the mainland of Lindås, west of
Mongstad and the other connects the south end of Fosnøyna to the island of Radøy (which in turn is connected to the mainland.
