Härjedalen (Swedish: [ˈhæ̂rjɛˌdɑːlɛn] ) is a historical province (landskap) in the centre of Sweden. It borders the Norwegian county of Trøndelag, as well as the provinces of Dalarna, Hälsingland, Medelpad and Jämtland. The province originally belonged to Norway, but was ceded to Sweden in the Second Treaty of Brömsebro in 1645. The province forms the bulk of Härjedalen Municipality of which the village of Sveg is the seat. Etymology. The name Härjedalen, from Old West Norse Herjárdalr, literally means the "Valley of the Härje river".
https://en.wikipedia.org/wiki/H%C3%A4rjedalen