Ona or
One (sometimes
Oøy or
Oni) is an
island in
Øygarden municipality in
Hordaland county,
Norway. The island lies in the Øygarden
archipelago just north of the island of
Blomøyna and south of
Alvøyna. The
Hjeltefjorden lies east of the island and the
North Sea and some smaller island lie to the west. The southern portion of the island of Ona is dominated by the
Kollsnes natural gas processing facility. The island is low, rocky, and barren, with its highest point being the tall Vareidet hill.