The term 'Major German River' refers to the Rhine, a river that runs through Switzerland, Liechtenstein, Austria, France, Germany, and the Netherlands. It is one of the longest rivers in Europe, stretching for over 1, 200 miles. The Rhine is an important waterway for transportation and commerce, and it has been used for centuries as a major trade route. It is also a popular tourist destination, with many castles and other attractions along its banks.