Twentieth century

The population of Helsinki was already over 100,000 in the 1910s, and despite the tumultuous nature of Finnish history during the first half of the 20th century (including the Finnish Civil War and the Winter War which both left marks on the city), Helsinki continued its steady development. At the beginning of the 20th century, there were approximately the same number of Finnish and Swedish speakers in Helsinki; the majority of the workers were Finnish-speaking. The local Helsinki slang (or stadin slangi) developed among Finnish children and young people as a mixed Finnish-Swedish language from the 1890s, and it was also influenced by the German language and Russian language , and from the 1950s onwards, slang began to become more Finnish.^[43] A landmark event was the 1952 Olympic Games, held in Helsinki. Finland's rapid urbanization in the 1970s, occurring late relative to the rest of Europe, tripled the population in the metropolitan area, and the Helsinki Metro subway system was built. The relatively sparse population density of Helsinki and its peculiar structure have often been attributed to the lateness of its growth.^{[citation needed]}

Geography

Helsinki seen from Sentinel-2 Main article: Geography of Helsinki

Called the "Daughter of the Baltic"^[2] or the "Pearl of the Baltic Sea",^[3][44] Helsinki is on the tip of a peninsula and on 315 islands. The inner city is located on a southern peninsula, Helsinginniemi ("Cape of Helsinki), which is rarely referred to by its actual name, Vironniemi ("Cape of Estonia"). Population density in certain parts of Helsinki's inner city area is comparatively higher, reaching 16,494 inhabitants per square kilometre (42,720/sq mi) in the district of Kallio, but as a whole Helsinki's population density of 3,050 per square kilometre (7,900/sq mi) ranks the city as rather sparsely populated in comparison to other European capital cities.^[45][46] Outside of the inner city, much of Helsinki consists of postwar suburbs separated by patches of forest. A narrow, 10 kilometres (6.2 mi) long Helsinki Central Park, stretching from the inner city to Helsinki's northern border, is an important recreational area for residents. The City of Helsinki has about 11,000 boat berths and possesses over 14,000 hectares (34,595 acres; 54.1 sq mi) of marine fishing waters adjacent to the Capital Region. Some 60 fish species are found in this area and recreational fishing is popular.

Major islands in Helsinki include Seurasaari, Vallisaari, Lauttasaari, and Korkeasaari – the latter being the site of Finland's largest zoo called Korkeasaari Zoo. Other noteworthy islands are the fortress island of Suomenlinna (Sveaborg), the military island of Santahamina, and Isosaari. Pihlajasaari island is a favorite summer spot for gay men and naturists, comparable to Fire Island in New York City.

There are 60 nature reserves in Helsinki with a total area of 95,480 acres (38,640 ha). Of the total area, 48,190 acres (19,500 ha) are water areas and 47,290 acres (19,140 ha) are land areas. In addition, the city owns seven nature reserves in Espoo, Sipoo, Hanko and Ingå. The largest nature reserve is the Vanhankaupunginselkä, with an area of 30,600 acres (12,400 ha). The city's first nature reserve, Tiiraluoto of Lauttasaari, was established in 1948.^[47]

The title plant of Helsinki is the Norway maple and the title animal is the red squirrel.^[48]