Question: Broad Top is a plateau located in south-central Pennsylvania bounded to the east by what long, steep, narrow mountain ridge in the Ridge-and-Valley (or Allegheny Mountains) physiographic province of the Appalachian Mountains?
Sentence (from "Wallkill Valley"): In a broader sense, the Wallkill Valley is part of the Ridge-and-Valley physiographic province of the Appalachian Mountains, while the Catskills further to the north and west are part of the Appalachian Plateau.
Relevant evidence: No