Lauttasaari

thumb|right|300px|Aerial view of Lauttasaari thumb|right|300px|Lauttasaari in Helsinki area Lauttasaari (; ) is an island in Helsinki, Finland, about west of the city centre. Together with some surrounding unpopulated small islands, Lauttasaari is also a district of Helsinki. With 23,226 residents as of 2017, the island is Finland's second largest by population, after Fasta Åland. Its land area is 3.85 km.

metro station in Helsinki, Finland

metro station in Helsinki, Finland; the only metro station in the world located under the sea

thumb|Koivusaari island Koivusaari (; ; literally the "Birch Island") is an island and a part of the district of Lauttasaari in Helsinki, Finland. The island hosts two yacht clubs and a former Nokia training centre. The current island of Koivusaari has been formed by combining the island of Koivusaari proper with the island of Leppäsaari to the south of it and expanding it. Since the late 1990s and early 2000s there have been plans to construct a new residential area on reclaimed land in Koivusaari, served by the Koivusaari metro station.