Värmdö is an island in the innermost region of the Stockholm archipelago and covers an area of 181.40 km, making it the largest island in the archipelago. Värmdö is after Gotland and Öland the third largest island on the eastern coast of Sweden.
Värmdö lies in Stockholm County. Most of it forms part of Värmdö Municipality along with other islands, but the western end is part of Nacka Municipality, which lies mostly on the mainland, to which Värmdö is connected by a road bridge.
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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.
Gustavsberg is a locality situated on the island of Värmdö in Sweden's Stockholm archipelago. From an administrative perspective, it is in Stockholm County and is the seat of Värmdö Municipality. It has 24,000 inhabitants as of 2023. It is most known for its porcelain factory, Gustavsberg porcelain, and toilet bowls distributed nationwide and internationally.
Ösbyträsk Nature Reserve is located nearby.