Sund is a municipality located in the Ålands landsbygd (rural Åland) region of the Åland Islands, an autonomous Swedish-speaking region of Finland. The municipality is situated in the central part of the archipelago.
As a rural municipality within Åland, Sund is part of the distinctive culture and governance structure of the Åland Islands, which maintains its own autonomy within Finland and Swedish as its primary language. The municipality encompasses several islands characteristic of the archipelago landscape.