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Having been compressed under the enormous weight of the glaciers, terrain in Finland is rising due to the post-glacial rebound. The effect is strongest around the Gulf of Bothnia, where land steadily rises about 1 cm (0.4 in) a year. As a result, the old sea bottom turns little by little into dry land: the surface area of the country is expanding by about 7 square kilometres (2.7 sq mi) annually.[100] Relatively speaking, Finland is rising from the sea.[101]
The landscape is covered mostly by coniferous taiga forests and fens, with little cultivated land. Of the total area, 10% is lakes, rivers, and ponds, and 78% is forest. The forest consists of pine, spruce, birch, and other species.[102] Finland is the largest producer of wood in Europe and among the largest in the world. The most common type of rock is granite. It is a ubiquitous part of the scenery, visible wherever there is no soil cover. Moraine or till is the most common type of soil, covered by a thin layer of humus of biological origin. Podzol profile development is seen in most forest soils except where drainage is poor. Gleysols and peat bogs occupy poorly drained areas.
Phytogeographically, Finland is shared between the Arctic, central European, and northern European provinces of the Circumboreal Region within the Boreal Kingdom. According to the WWF, the territory of Finland can be subdivided into three ecoregions: the Scandinavian and Russian taiga, Sarmatic mixed forests, and Scandinavian Montane Birch forest and grasslands.[104] Taiga covers most of Finland from northern regions of southern provinces to the north of Lapland. On the southwestern coast, south of the Helsinki-Rauma line, forests are characterized by mixed forests, that are more typical in the Baltic region. In the extreme north of Finland, near the tree line and Arctic Ocean, Montane Birch forests are common. Finland had a 2018 Forest Landscape Integrity Index mean score of 5.08/10, ranking it 109th globally out of 172 countries.[105]
Similarly, Finland has a diverse and extensive range of fauna. There are at least sixty native mammalian species, 248 breeding bird species, over 70 fish species, and 11 reptile and frog species present today, many migrating from neighbouring countries thousands of years ago. Large and widely recognized wildlife mammals found in Finland are the brown bear, grey wolf, wolverine, and elk. Three of the more striking birds are the whooper swan, a large European swan and the national bird of Finland; the Western capercaillie, a large, black-plumaged member of the grouse family; and the Eurasian eagle-owl. The latter is considered an indicator of old-growth forest connectivity, and has been declining because of landscape fragmentation.[106] Around 24,000 species of insects are prevalent in Finland some of the most common being hornets with tribes of beetles such as the Onciderini also being common. The most common breeding birds are the willow warbler, common chaffinch, and redwing.[107] Of some seventy species of freshwater fish, the northern pike, perch, and others are plentiful. Atlantic salmon remains the favourite of fly rod enthusiasts.
The endangered Saimaa ringed seal, one of only three lake seal species in the world, exists only in the Saimaa lake system of southeastern Finland, down to only 390 seals today.[108][109] The species has become the emblem of the Finnish Association for Nature Conservation.[110]
A third of Finland's land area originally consisted of moorland, about half of this area has been drained for cultivation over the past centuries.[111]