    Sentence t. Besides viniculture, whats a  “lominant economic sector of the Middle  Rhine?    Sentence 2 With ts outstanding  “wchitectural monuments, the slopes full  of vines, settlements crowded on the  narow river banks and scores of  castles lined up along the top of the  steep slopes, the Middle Xhine Valley  can be considered the epitome of the    Rhine romanticism.