The Fort de Viraysse is a fortification complex in the Cottian Alps overlooking the Ubaye Valley. It was built between 1885 and 1888 to defend France against invasion from Italy. The position was one of the highest military posts in France at , and the only one in the Alps with a clear view of Italy. It was constructed as part of the Séré de Rivières system of fortifications, as a small post with an enclosing wall, and formed part of the elaborate fortifications centering on the Fort de Tournoux. The Col de Mallemort is directly adjacent to the fort.