Sentence:  The castled crag of Drachenfels/ Frowns o'er the wide and winding Rhine/ Whose breast of waters broadly swells/ Between the banks which bear the vine/ And hills all rich with blossomed trees/ And <WSD>fields</WSD> which promise corn and wine/ And scatter'd cities crowning these/ Whose far white walls along them shine,/ Have strew'd a scene, which I should see/ With double joy wert "thou" with mo. 
Meaning of the word marked with <WSD> tags:  (wide, open space used to grow crops or to hold farm animals) A wide, open space that is usually used to grow crops or to hold farm animals.