Catskill Escarpment
... that the Catskill Escarpment is the only clearly defined boundary of the Catskill Mountains?
... that the <b id="mwCE4"><a href="./Catskill_Escarpment" id="mwCE8" rel="mw:WikiLink" title="Catskill Escarpment">Catskill Escarpment</a></b> is the only clearly defined boundary of the <a href="./Catskill_Mountains" id="mwCFA" rel="mw:WikiLink" title="Catskill Mountains">Catskill Mountains</a>?