The eastern part of Rødøy is located on the mainland, just east of the Saltfjellet mountain range. The rest of the municipality consists of islands to the west including Gjerdøya, Storselsøya, Myken, Nesøya, Rangsundøya, Renga, and Rødøya. The westernmost part of the municipality is the Myken islands in the Vestfjorden, where the Myken Lighthouse is located.