The French natural and man-made waterways network is the largest in Europe[1] extending to over 8,500-kilometre (5,300 mi) of which VNF manages the navigable sections. The assets managed by VNF comprise 6,700-kilometre (4,200 mi) of waterways, made up of 3,800-kilometre (2,400 mi) of canals and 2,900-kilometre (1,800 mi) of navigable rivers, 494 dams, 1595 locks, 74 aqueducts, 65 reservoirs, 35 tunnels and a land area of 800 km2 (310 sq mi).[2] Two significant waterways which are not under VNF's control are the navigable sections of the River Somme and the Brittany Canals, which are both under local management, and neither is the River Lot in Aquitaine.