(informal) a resort area in the Catskill Mountains of New York that was patronized primarily by Jewish guests WordNet 3.0 & Open English WordNet

The Borscht Belt, or Yiddish Alps, is a colloquial term for the mostly defunct summer resorts of the Catskill Mountains in parts of Sullivan, Orange, and Ulster counties in the U.S. state of New York, straddling both Upstate New York and the northern edges of the New York metropolitan area. Wikipedia

summer resort area in the Catskill Mountains, USA Wikidata

An area in upstate New York, in the Catskills, in which there were once many Jewish camps and resorts. Wiktionary

Area in upstate New York, in the Catskills, in which there were once many Jewish camps and resorts. Wiktionary (translation)