The harbour of Port Blair is well supplied with buoys and harbour lights, and is crossed by ferries at fixed intervals, while there are several launches for hauling local traffic. On Ross Island there is a lighthouse visible for 19 m.
Ice-breaking car ferries run across the lake all winter.
In cases where the route of a line runs across a river or other piece of water so wide that the construction of a bridge is either impossible or would be more costly than is warranted by the volume of traffic, the expedient is sometimes adopted of carrying the wagons and carriages across bodily with their loads on train ferries, so as to avoid the inconvenience and delay of transshipment.
Steam ferries connect it with Papendrecht and Zwyndrecht on the opposite shore, and it has excellent communication by water in every direction.
Ferries or traghetti for crossing the canals were also established as early as the 13th century; we find record of ferries at San Gregorio, San Felice, San Toma, San Samuele, and so on, and also of longer ferries to the outlying islands like Murano and Chioggia, or to the mainland at Mestre and Fusina.