Called the "Daughter of the Baltic" or the "Pearl of the Baltic Sea", 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  in the district of Kallio, but as a whole Helsinki's population density of  ranks the city as rather sparsely populated in comparison to other European capital cities. Outside of the inner city, much of Helsinki consists of postwar suburbs separated by patches of forest. A narrow,  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.