One of the mysteries of the English language finally explained.
The world of Rip Van Winkle, specifically the Catskill Mountains in New York State (the site of Rip Van Winkle's sleep).
Late 19th century; earliest use found in Outing: an illustrated monthly magazine of recreation. From the name of Rip Van Winkle + -dom.
Rip Van Winkledom/ˌrɪp van ˈwɪŋkldəm/
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