Question: In what mountain range does the river originate which serves as the backdrop for Wilderstein, a 19th-century Queen-Anne-style country house located in Rhinebeck, Dutchess County, New York, United States?
Sentence (from "Hudson River"): The lower half of the river is a tidal estuary occupying the Hudson Fjord, an inlet which formed during the most recent period of North American glaciation, estimated at 26,000 to 13,300 years ago.
Relevant evidence: No