The first means of transportation were by water; the Vikings have traded extensively via the waterways and river systems of northern Europe, while in the south the Danube and Mediterranean was used. Today, large fleets of ships are maintained by several countries which import and export a great deal of goods, and have transformed many coastal cities into major sea ports. | The first means of transportation were by water; the Vikings have traded extensively via the waterways and river systems of northern Europe, while in the south the Danube and Mediterranean was used. Today, large fleets of ships are maintained by several countries which import and export a great deal of goods, and have transformed many coastal cities into major sea ports. |