Ingmarsö is an island located in the Stockholm archipelago in Sweden. The westernmost part of Ingmarsö consists of the Brottö peninsula.
Today, Ingmarsö has around 150 permanent residents and around thirty companies, including a boatyard, restaurant, shop with pharmacy, system and postal agents, home bakery, carpenters and other entrepreneurs.
The Stockholm Archipelago (Swedish: Stockholms skärgård) is the largest archipelago in Sweden, and the second-largest archipelago in the Baltic Sea (the largest being the Archipelago Sea across the Baltic in Finland). Part of the archipelago has been designated as a Ramsar site since 1989.
Stockholm Archipelago has been found to have slightly over 24,000 islands, islets and skerries and covers approximately 1,700 km² of which approximately 530 km² is land. There are around 10,000 permanent residences and 50,000 holiday homes in the archipelago. Residents are found on all the larger islands closest to the coast that have fixed bridges or ferry connections with road ferries, such as Vaxholm, Ingarö, Värmdö, Yxlan, Blidö, Ljusterö and Väddö, but also on many of the larger islands farther out from the coast, as Ingmarsö, Möja, Runmarö, Nämdö, Ornö and Utö, which are served by passenger ships with fixed itineraries.