Sør-Trøndelagball

 was a county of. Now this county and Nord-Trøndelagball went into reunification. It borders Hedmarkball, Opplandball and Møre og Romsdalball.

History
born as a 2ball, adopted by Medieval Norwayball, Kalmar Unionball, Post-Kalmar Norwayball, Sweden-Norwayball and Norwayball.