There are 60 nature reserves in Helsinki with a total area of . Of the total area,  are water areas and  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 . The city's first nature reserve, Tiiraluoto of Lauttasaari, was established in 1948.