The Troll Wall (Norwegian: Trollveggen) is part of the mountain massif Trolltindene (Troll Peaks) in the Romsdalen valley, near Åndalsnes and Molde, on the Norwegian west coast. Trollveggen is part of the Reinheimen National Park in the municipality of Rauma in Møre og Romsdal county. The Troll Wall is the tallest vertical rock face in Europe, about 1,100 metres (3,600 ft) from its base to the summit of its highest point. At its steepest, the summit ridge overhangs the base of the wall by nearly 50 metres (160 ft). The Rauma River and the European Route E136 runs just to the east of the wall. The rock is gneiss, formed into a broken rock wall of huge corners, concave roofs, and crack systems, topped with a series of spires and pinnacles on the summit rim. The rock is generally loose, and rockfall is the norm on this north-facing big wall. There was a series of large rockfalls on the wall in September 1998, radically changing the character of several climbing routes.