索姆河
The French natural and man-made waterways network is the largest in Europe extending to over of which (VNF, ), the French navigation authority, manages the navigable sections. Some of the navigable rivers include the Loire, Seine and Rhône. The assets managed by VNF comprise of waterways, made up of of canals and of navigable rivers, 494 dams, 1595 locks, 74 navigable aqueducts, 65 reservoirs, 35 tunnels and a land area of . Two significant waterways not under VNF's control are the navigable sections of the River Somme and the Brittany Canals, which are both under local management.