Question: Sooneck Castle is located in he upper middle valley of a European river that ventually empties into what?
Sentence (from "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.
Relevant evidence: Yes