EMPTYING into the English Channel at LE Havre.The river is 485 miles (780 kilometers) long and with its tributaries drains an AREA of about 30,400 square miles (78,700 square kilometers).Rhine:-Rhine River, German Rhein, French Rhin, Dutch Rijn, Celtic Renos, Latin Rhenus, river and WATERWAY of western EUROPE.It is culturally and historically one of the great rivers of the continent and among the most important arteries of industrial transport in the world.It flows from two small headways in the Alps of east-central Switzerland north and west to the North Sea, into which it drains through the Netherlands.The length of the Rhine was long given as 820 miles (1,320 km), but in 2010 a shorter distance of about 765 miles (1,230 km) was proposed.Danube:Danube River, the second longest in Europe after the Volga.It rises in the Black Forest mountains of western Germany and flows for some 1,770 miles (2,850 km) to its mouth on the Black Sea.Along its course, it passes through 10 countries: Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine.Potomac:-Potomac River is found within the Mid-Atlantic region of the United States and flows from the Potomac Highlands into the Chesapeake Bay.The rive is approximately 405 miles (652 km) long, with a drainage area of about 14,700 square miles.