partly acting on behalf of the Hanseatic league The island was part of Swedish Estonia from 15631720, after which it passed to the Russian as part of the Governorate of Estonia, although Dagö's Swedish population kept most of their privileges. Most of the island's previously numerous Swedish speaking population emigrated or were "Estonia" during the period of Imperial Russian rule, although a small minority remains to this day. Estonian Swedes are also known as "aibofolke" (meaning island people in Swedish) or "rannarootslased" (meaning coastal Swedes in Estonian). Transport Road transport from Estonian mainland to Hiiumaa involves a 90-minute (28 km) ferry crossing from Rohuküla to Heltermaa, which is 25 km by road from Kärdla. There are about 10 ferry departures a day. In the summer weekends, getting car space on the ferry usually requires advance booking.