Runmarö is an island located in the Stockholm archipelago in Sweden. The island is known for its many species of orchids (at least 27 different kinds) and 9 marshy lakes. . Notable residents. Author and entomologist Fredrik Sjöberg lives on the island with his family. The island is frequently referenced in his 2014 novel The Fly Trap. References. https://en.wikipedia.org/wiki/Runmar%C3%B6