Nidaroy nature reserve, Trondheim city
The river Nidelva is the "heart" of Trondheim. The city was founded in the Middle ages, in the Viking era, at the banks of the river mouth next to the fjord. The river and its banks form a nature system called Nidelvkorridoren, the Nidelva corridor, all the way from Selbu lake to the fjord.
Within the historical city centre at Nidaro the river makes a bend and takes a loop around the Nidaros Cathedral. This bend, or swing, Elvesvingen, has rich vegetation and animal life: Atlantic salmon, trout, seatrout and other fish, beaver, badger, fox and other animals, and a large variety of bird species, both stationary and migratory.