Mary Island State Park

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Last Updated: December 5, 2025

Mary Island State Park is located in the Thousand Island region of New York and is known for its scenic views and outdoor recreational activities.


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Summary

The park is situated on an island in the St. Lawrence River and is accessible only by boat.

There are many good reasons to visit Mary Island State Park, including its beautiful natural setting, diverse wildlife, and opportunities for hiking, fishing, and boating. The park is also home to several unique points of interest, such as the historic Mary Island Lighthouse and the Thousand Islands Nature Center, which offers educational exhibits and programs.

Interesting facts about the area include its history as a popular vacation destination for wealthy families in the late 19th and early 20th centuries, and the fact that the St. Lawrence River is considered one of the cleanest and clearest rivers in North America.

The best time of year to visit Mary Island State Park is during the summer months, when the weather is warm and the park is open for outdoor recreational activities. However, visitors should be aware that the park is only accessible by boat, and that some facilities may be closed or limited during the off-season.

       

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Park & Land Designation Reference

National Park
Large protected natural areas managed by the federal government to preserve significant landscapes, ecosystems, and cultural resources; recreation is allowed but conservation is the priority.
State Park
Public natural or recreational areas managed by a state government, typically smaller than national parks and focused on regional natural features, recreation, and education.
Local Park
Community-level parks managed by cities or counties, emphasizing recreation, playgrounds, sports, and green space close to populated areas.
Wilderness Area
The highest level of land protection in the U.S.; designated areas where nature is left essentially untouched, with no roads, structures, or motorized access permitted.
National Recreation Area
Areas set aside primarily for outdoor recreation (boating, hiking, fishing), often around reservoirs, rivers, or scenic landscapes; may allow more development.
National Conservation Area (BLM)
BLM-managed areas with special ecological, cultural, or scientific value; more protection than typical BLM land but less strict than Wilderness Areas.
State Forest
State-managed forests focused on habitat, watershed, recreation, and sustainable timber harvest.
National Forest
Federally managed lands focused on multiple use—recreation, wildlife habitat, watershed protection, and resource extraction (like timber)—unlike the stricter protections of national parks.
Wilderness
A protected area set aside to conserve specific resources—such as wildlife, habitats, or scientific features—with regulations varying widely depending on the managing agency and purpose.
Bureau of Land Management (BLM) Land
Vast federal lands managed for mixed use—recreation, grazing, mining, conservation—with fewer restrictions than national parks or forests.
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