From The Art and Popular Culture Encyclopedia
"We had agreed to descend the Rhine in a boat from Strasbourg to Rotterdam, whence we might take shipping for London. During this voyage we passed many willowy islands and saw several beautiful towns. We stayed a day at Mannheim, and on the fifth from our departure from Strasbourg, arrived at Mainz. The course of the Rhine below Mainz becomes much more picturesque. The river descends rapidly and winds between hills, not high, but steep, and of beautiful forms. We saw many ruined castles standing on the edges of precipices, surrounded by black woods, high and inaccessible. This part of the Rhine, indeed, presents a singularly variegated landscape. In one spot you view rugged hills, ruined castles overlooking tremendous precipices, with the dark Rhine rushing beneath; and on the sudden turn of a promontory, flourishing vineyards with green sloping banks and a meandering river and populous towns occupy the scene."--Frankenstein (1818) by Mary Shelley
The Rhine is a European river that runs from the Swiss canton of Grisons in the southeastern Swiss Alps through Germany and eventually flows into the North Sea coast in the Netherlands and is the twelfth longest river in Europe.
The Rhine and the Danube formed most of the northern inland frontier of the Roman Empire and, since those days, the Rhine has been a vital and navigable waterway carrying trade and goods deep inland. It has also served as a defensive feature and has been the basis for regional and international borders. The many castles and prehistoric fortifications along the Rhine testify to its importance as a waterway. River traffic could be stopped at these locations, usually for the purpose of collecting tolls, by the state that controlled that portion of the river.
The Rhine Gorge between Rüdesheim am Rhein and Koblenz is listed as a UNESCO World Heritage Site. Near Sankt Goarshausen, the Rhine flows around the famous rock Lorelei. With its outstanding architectural monuments, the slopes full of vines, settlements crowded on the narrow river banks and scores of castles lined up along the top of the steep slopes, the Middle Rhine Valley can be considered the epitome of the Rhine romanticism.