Introducing an extraordinary and truly one-of-a-kind St. Lawrence River estate in the heart of the Thousand Islands—an exceptional legacy property offering luxury, privacy, and timeless riverfront elegance. Meticulously maintained and thoughtfully designed, this remarkable waterfront retreat showcases breathtaking views of Boldt Castle and passing freighters from one of the most desirable stretches of the river. The stunning 4-bedroom, 3-bath main residence blends historic charm with refined comfort, highlighted by a magnificent granite fireplace that creates a warm and inviting centerpiece for the home. Expansive windows and seamless indoor-outdoor living spaces allow the beauty of the river to be enjoyed from nearly every angle. Outside, discover a protected deep-water boathouse capable of accommodating multiple boats and watercraft, making this property a dream for boating enthusiasts. A massive detached garage provides ideal off-season boat storage and additional utility space, while above it sits an elegant 3-bedroom, 2-bath guest apartment complete with a sprawling screened-in second-story porch offering unforgettable panoramic river views. The square footage total reflects both the second building apartment and the living space porch above the garage. Perfectly landscaped and surrounded by the natural beauty of the Thousand Islands, this rare offering delivers a level of peace, prestige, and waterfront living that is seldom found. Every detail of this remarkable estate reflects quality, elegance, and craftsmanship at the highest level. This is the type of property that truly must be experienced in person—an extraordinary waterfront retreat so impressive and refined, it is certain to exceed the expectations of even the most discerning buyers.