The Dal River (or Dalälven in Swedish) is a river in central Sweden that flows from the north of Dalarna and runs into the sea in northern Uppland; it is commonly considered to be the southern border of Norrland. The northern part is split into two rivers: Österdalälven and Västerdalälven. The two connect in Djurås. It is over 520 km long — the second longest river in Sweden, and has a hydropower potential of 1420 megawatts, of which 2/3 is utilized. The largest power plant is located at the Trängslet dam. Dalälven has been significant historically as a raft transport route.