In river and maritime navigation there is an overlap between inland shipping – i.e. transport carried out exclusively on rivers and canals – and sea traffic. Owing to their size, vessels used in river and maritime navigation are capable of navigating both at sea (along coastlines) and on large, developed inland waterways (e.g. on the Rhine river up to Duisburg). Thus, by using appropriate navigable units and coastal motor vessels, additional shipping connections may be established, such as short-sea shipping (see Sect. 4.2.1).