Helsinki is spread across a number of bays and peninsulas and over a number of islands. The inner city area occupies a southern peninsula, which is rarely referred to by its actual name Vironniemi. Population density in certain parts of Helsinki's inner city area is very high, 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 it as quite sparsely populated in comparison to other European capital cities. Much of Helsinki outside the inner city area consists of postwar suburbs separated from each other by patches of forest. A narrow, ten-kilometre-long (6 mi) Helsinki Central Park that stretches from the inner city to the northern border of Helsinki is an important recreational area for residents.
Major islands in Helsinki include Seurasaari, Lauttasaari and Korkeasaari – the lattermost being the site of the country's biggest zoo. Other significant islands are the fortress island of Suomenlinna (Sveaborg) and the military island of Santahamina. Pihlajasaari island is a favorite summer spot for gay men and naturists, very much comparable to Fire Island off New York City
