Estonian Swedes on Ruhnu, 1937
Estonian Swedish (Swedish: estlandssvenska)  (Estonian: rannarootsi keel) are the eastern varieties of Swedish that were spoken in the formerly Swedish-populated areas of Estonia (locally known as Aiboland) on the islands of Ormsö (Vormsi), Ösel (Saaremaa), Dagö (Hiiumaa) and Runö (Ruhnu), and the peninsula (former island) of Nuckö (Noarootsi), by the local Estonian Swedes.
Until the evacuation of the Estonian Swedes near the end of World War II, both Swedish and Estonian were commonly spoken on the named islands. It is not clear if there are any mother-tongue speakers left. After Estonia's independence following the dissolution of the Soviet Union, Estonian Swedish experienced a revival, with courses in the language being offered on Dagö and Ösel.
Currently the number of native speakers is unknown but assumed to be low.
Estonian Swedish comprises a number of sub-dialects, for example nuckömål and rågömål.
An example of the nuckömål dialect from the Nordisk familjebok, compared with standard modern Swedish: