The Garabit Viaduct (Viaduc de Garabit in French) is a railway arch bridge spanning the River Truyère near Ruynes-en-Margeride (Fr), Cantal, France, in the mountainous Massif Central region. The bridge was constructed between 1882 and 1884 by Gustave Eiffel, with structural engineering by Maurice Koechlin, and was opened in 1885. It is 565 m (1,854 ft) in length and has a principal arch of 165 m (541 ft) span.