The Saint Lawrence River in New York forms a crucial part of the border between the United States and Canada, flowing northeast from Lake Ontario towards the Gulf of Saint Lawrence. While the river extends far beyond New York's borders, the state's portion offers diverse paddling opportunities, particularly in the renowned Thousand Islands region. The New York section of the Saint Lawrence River spans approximately 115 miles, with about 85 miles being navigable by canoe or kayak. The river's width varies dramatically, from narrow channels between islands to vast open stretches. Major tributaries in New York include the Oswegatchie, Grasse, and Raquette Rivers.

Paddling opportunities range from tranquil flatwater excursions to more challenging routes with stronger currents. The Thousand Islands region, near Alexandria Bay, is a paddler's paradise, offering a maze of waterways between its 1,864 islands. This area is suitable for day trips and multi-day adventures, with numerous camping options on the Canadian side. The river's difficulty varies from flatwater to Class IV rapids, depending on the specific section and nearby tributary confluences. Beginners can enjoy calm bays and protected channels, while more experienced paddlers can tackle areas with stronger currents and boat traffic.

Late spring through early fall is the ideal paddling season, with summer offering the warmest conditions. However, paddlers should be prepared for sudden weather changes and be aware of increased boat traffic during peak tourist season. The river ecosystem supports diverse wildlife, including various fish species, waterfowl, and occasionally larger mammals like deer along the shoreline. Paddlers may spot ospreys, herons, and even bald eagles.

Key landmarks include Boldt Castle on Heart Island, the Thousand Islands Bridge, and numerous historic lighthouses. The Wellesley Island State Park offers an excellent starting point for shorter trips, with a 2-mile paddle across Eel Bay to Canoe Point being a popular beginner route. Major access points include Alexandria Bay, Cape Vincent, and Clayton, all offering amenities for paddlers. Massena and Ogdensburg provide access to the river's wider sections downstream.

The Saint Lawrence River holds significant historical importance as a major transportation route and has played a crucial role in the development of New York's North Country. Today, it remains vital for shipping, recreation, and as an international border. Safety considerations include being aware of large vessel traffic, potentially strong currents, and rapidly changing weather conditions. Paddlers should always wear life jackets and be mindful of international border regulations when exploring the Thousand Islands area.

For those seeking multi-day adventures, the 36-mile stretch from Canton to Massena offers an extended journey with several portages, allowing paddlers to experience a substantial portion of the river's New York section.