WEB5 days ago · The Borscht Belt, or Jewish Alps, is a colloquial term for the mostly defunct summer resorts of the Catskill Mountains in parts of Sullivan, Orange, and. Catskill Mountains. mountains’ valleys and cloves. In the mid–20th century, summer resorts in the Catskills, nicknamed the Borscht Belt, were a major vacation destination. Kutsher’s Hotel.