Sooneck Castle is located in he upper middle valley of a European river that ventually empties into what?
Sooneck Castle: Sooneck Castle (German: "Burg Sooneck" ) (also known as Saneck or Sonneck, previously also known as Schloss Sonneck) is a castle in the upper middle valley of the Rhine, in the Mainz-Bingen district of Rhineland-Palatinate, Germany. Rhine: The Rhine (Latin: "Rhenus" , Romansh: "Rein" , German: "Rhein" , French: "le Rhin" , Dutch: "Rijn" ) is a European river that begins in the Swiss canton of Graubünden in the southeastern Swiss Alps, forms part of the Swiss-Liechtenstein, Swiss-Austrian, Swiss-German and then the Franco-German border, then flows through the Rhineland and eventually empties into the North Sea in the Netherlands.
North Sea