Färnebofjärden National Park is a Swedish national park traversed by the river Dalälven, about 140 km north of Stockholm. It covers 10,100 ha , of which 4,110 ha aquatic, on the frontier between the counties of Dalarna and Gävleborg.
After the retreat of the ice sheet that covered the region after the last ice age, the river found itself rerouted by an esker onto a plain uniquely ribbed by the ridges of other eskers, where it formed a succession of rapids and wide bays , which the river inundates during the spring floods. This particular hydrography, along with the park's proximity to the ecological frontier between the north and the south, has favored the development of a fauna and flora of great biodiversity. The park possesses coniferous, mixed, and broadleaf forests, some of which quite ancient, spared by the logging industry because of their inaccessibility. These forests constitute the ideal environment for numerous species, in particular birds, with critical densities of woodpeckers and owls.
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