changed from shallow bays into lakes. Most of the lakes in Espoo are located to the north of the Finnish national road 1, particularly in the lake highlands in Nuuksio. There are three pools named Pitkäjärvi ("long lake"): Pitkäjärvi, Nuuksion Pitkäjärvi and Velskolan Pitkäjärvi. The largest lake in Espoo is Lake Bodom with a surface area of 4.1 square kilometres and an average depth of 4.3 metres. The largest depth of Nuuksion Pitkäjärvi is 18 metres and the average depth is 6.5 metres, and there are tens of lakes and ponds in its drainage basin of 60 square kilometres. There are few lakes in southern Espoo. The shallow lake Hannusjärvi with a surface area of six hectares is located in Kaitaa and the small lake Pentalanjärvi is located in the island of Pentala. Because the sweet water pools to the south of the Salpausselkä ridges formed when the ancient bays separated from the sea into lakes because of upthrust, only very few islands developed in them. One of the few inland islands in Espoo is an island of fifteen hectares in the lake Saarijärvi located near the border to Vihti. There was a suggestion to name the rocky island covered in pine forests as Partiosaari, but nothing became of this. The differences in the surface heights of the lakes in Espoo are considerable. Lake Pieni Majaslampi is located the highest up, 97 metres above sea level. Lake Saarijärvi near it is located 25 metres lower. Because of the height differences, small rapids sometimes form in spring time in the creeks between adjacent water pools. Features Although Espoo is relatively highly populated, it has large amounts of the countryside and natural wilderness, particularly in the city's western and northern portions. The city has a total of 71 lakes, the largest of which are Lake Bodom, Nuuksion Pitkäjärvi, Vanhankylän Pitkäjärvi, Loojärvi, Velskolan Pitkäjärvi, Saarijärvi, Matalajärvi, Siikajärvi, and Lippajärvi. The city has a large coastline on the Gulf of Finland. Espoo has six Natura 2000 protected areas: Bånberget forests, Espoonlahti–Saunalahti bay area (partially in Kirkkonummi), Laajalahti bay, Matalajärvi lake, Nuuksio National Park (partially in Kirkkonummi and Vihti), as well as forests in Vestra (partially in Vantaa). The official animal of Espoo is the Siberian flying squirrel, the official bird is the common blackbird, and the official plant is Anemone nemorosa. Flora and fauna The city's Central Park's fauna represents a typical range of