 The Roman Empire completely encircled the Mediterranean, which they called "our sea" (mare nostrum). Roman sailing vessels navigated the Mediterranean as well as the major rivers of the Empire, including the Guadalquivir, Ebro, Rhône, Rhine, Tiber and Nile. Transport by water was preferred where possible, and moving commodities by land was more difficult. Vehicles, wheels, and ships indicate the existence of a great number of skilled woodworkers.
