Nord-Trøndelag [ˈnuːɽ ²trøndəlɑːɡ] (listen) ("North Trøndelag") is a county constituting the northern part of Trøndelag in Norway. As of January 1, 2014, the county had 135,142 inhabitants, making it the country's fourth-least populated county. The largest municipalities are Stjørdal, Steinkjer—the county seat, Levanger, Namsos and Verdal, all with between 21,000 and 12,000 inhabitants. The economy is primarily centered on services, although there are significant industries in agriculture, fisheries, hydroelectricity and forestry. It has the lowest gross domestic product per capita of any county in the country.

Nord-Trøndelag covers 22,412 square kilometres (8,653 sq mi), making it the sixth-largest county, and consists of 23 municipalities. The district of Innherred runs along the east side of the Trondheimsfjord, and is the most populated area, with much farming. To the south lies the district of Stjørdalen, while in the north, the larger district of Namdalen stretches from the Norwegian Sea to the mountains bordering Sweden. West of the Trondheimsfjord lays Fosen. Nord-Trøndelag borders Sør-Trøndelag to the south and Nordland to the north. The western part of the county has several large valleys and consists largely of unpopulated wilderness, including four national parks. Snåsavatnet is the largest lake, while major rivers include Namsen, Verdalselva and Stjørdalselva.

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