 The Catskills became a major resort destination for Jewish New Yorkers in the mid-20th century.Borscht Belt is an informal term for the summer resorts of the Catskill Mountains in Sullivan and Ulster counties in upstate New York which were frequented by Ashkenazic Jews.Changes in vacationing patterns have led most of those travelers elsewhere, although there are still bungalow communities in the towns of Liberty, Bethel, Thompson and Fallsburg catering to Orthodox populations.