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Thousand Islands Marine National Park wilderness guide
Marine National Park · NY

Thousand Islands Marine National Park

Thousand Islands Marine National Park is a stunning aquatic preserve renowned for its archipelago of over 1,800 islands along the Saint Lawrence River between the United States and Canada. Ideal for water-based recreation, the area offers unparalleled opportunities for boating, fishing, and exploring historic sites.

Marine National Park55,0004+ Trails

Designation

Marine National Park

Total Wilderness Area

55,000

Elevation / Terrain

Diverse Wilderness

Field Editorial Guide

About Thousand Islands Marine National Park

Thousand Islands Marine National Park is a stunning aquatic preserve renowned for its archipelago of over 1,800 islands along the Saint Lawrence River between the United States and Canada. Ideal for water-based recreation, the area offers unparalleled opportunities for boating, fishing, and exploring historic sites.

Wilderness Landscape & Natural Heritage

Thousand Islands Marine National Park boasts a picturesque collection of islands scattered across the Saint Lawrence River, marking the border between the U.S. and Canada. This park's geographic features include rocky shores, lush forests, and freshwater ecosystems that provide habitat for diverse wildlife. Historically, the area has been significant for both Native American tribes and European settlers. Visitors flock to the park for its excellent water-based recreation opportunities, such as kayaking, fishing, and boating. Notable landmarks include Boldt Castle on Heart Island and the renowned Zavicon Island believed to feature the shortest international bridge. The park's charm lies in its ability to offer both adventure and tranquility, making it a beloved destination for nature enthusiasts and history buffs alike.

Field Guide · Marine National Park
Adventure Destinations

Notable Destinations Near Thousand Islands Marine National Park

Scenic viewpoints, outdoor landmarks, and notable points of interest within 30 miles.

Hiking Baxter Mountain Trail: A Short Climb with Big Rewards★ 7.5⌖ 19 miHiking
Lake Placid

Hiking Baxter Mountain Trail: A Short Climb with Big Rewards

Explore the 2.2-mile Baxter Mountain Trail near Keene. This easy route offers stunning views with only a moderate climb, making it ideal for families and beginners. Drive to the trailhead and experience the scenic Adirondacks, especially vibrant in spring and fall.

Mountain Biking in Beartown State Forest★ 7.5⌖ 34 miMountain Biking
Aspen Hollow Forest Road

Mountain Biking in Beartown State Forest

Explore over 6,000 acres of trails in Beartown State Forest, perfect for mountain biking enthusiasts. This moderate difficulty trail features scenic views and lush vegetation. Close to Great Barrington, MA, it's ideal for adventurers seeking a rugged experience.

Mountain BikingView Details→
Waterfall Wonder at High Falls★ 7.8⌖ 54 miHiking
High Falls

Waterfall Wonder at High Falls

Explore the scenic High Falls in Fine, NY, a waterfall wonder perfect for hiking and picnicking. With its peaceful environment and geological features, it's best visited in spring and fall.

Sunset Serenity at Blake McNeil Campgrounds★ 7.5⌖ 58 miCamping
Blake McNeil Campgrounds

Sunset Serenity at Blake McNeil Campgrounds

Sunset Serenity at Blake McNeil Campgrounds offers camping, kayaking, and hiking opportunities in Parishville, NY. Known for its tranquil sunsets and wildlife spotting, it's ideal for photographers and nature enthusiasts. The best time to visit is spring through fall.

Nature's Gem: Lower Falls of Moody★ 7.2⌖ 59 miHiking
Lower falls of Moody

Nature's Gem: Lower Falls of Moody

Visit the Lower Falls of Moody in Sevey, NY for a hiking adventure in Adirondack Park. Enjoy the waterfall, wildlife, and swimming opportunities. Suitable for all skill levels, best visited in spring or fall.

Sylvan Falls - Nature's Cascade in Parishville★ 7.8⌖ 62 miHiking
Sylvan Falls

Sylvan Falls - Nature's Cascade in Parishville

Explore Sylvan Falls in Parishville, NY. Ideal for hikers and photographers, this tranquil spot features a stunning waterfall and is accessible year-round. Enjoy the vibrant scenery, especially in spring and fall.

Key Wilderness Highlights

✦ Boldt Castle on Heart Island✦ Thousand Islands Bridge connecting the U.S. and Canada✦ Zavicon Island and its iconic bridge✦ Diverse bird-watching opportunities
Wilderness Recreation

Outdoor Adventures in Thousand Islands Marine National Park

Explore curated guides for top outdoor sports, trail networks, and wilderness activities.

Park Recreation

Boating

Available in Thousand Islands Marine National Park
Park Recreation

Fishing

Available in Thousand Islands Marine National Park
Park Recreation

Kayaking

Available in Thousand Islands Marine National Park
Park Recreation

Wildlife Viewing

Available in Thousand Islands Marine National Park
Park Recreation

Historical Tours

Available in Thousand Islands Marine National Park
Park Recreation

Photography

Available in Thousand Islands Marine National Park
The Ranger Station

Visitor Logistics & Essential Planning

Everything you need to know about entrance passes, seasons, visitor centers, road transit, and wildlife safety in Thousand Islands Marine National Park.

Passes & Fees

Entrance Requirements & Interagency Passes

Standard entry fees apply; additional permits for fishing and special tours may be required.

Wilderness Checklist

Carry paper topographic map & compass in remote zones.
Store all food and scented items in approved bear canisters.
Check wildfire / smoke advisories before backcountry departure.
Pack out everything you pack in (Leave No Trace).
Wilderness Stays

Camping & Overnight Stays in Thousand Islands Marine National Park

Frontcountry developed campgrounds, backcountry wilderness permit guidelines, and starry-night camping advice.

Wellesley Island State Park

Located on Wellesley Island, this campground offers easy access to trails and recreational facilities.

Keewaydin State Park

Situated near the riverbanks, ideal for anglers and families seeking a tranquil outdoor experience.

Adventure Basecamps

Gateway Towns Near Thousand Islands Marine National Park

Stay, dine, and gear up in these mountain towns and scenic basecamps surrounding the park.

Alexandria Bay
⌖ 0.91 miles
Gateway Basecamp

Alexandria Bay, New York

A riverside town offering a mix of water-based adventures, historic exploration, and seasonal outdoor activities in the scenic Thousand Islands region.

Late spring through early fallExplore Town
Wellesley Island
⌖ 1.84 miles
Gateway Basecamp

Wellesley Island, New York

A scenic island getaway in the St. Lawrence River offering a mix of water-based and forest outdoor activities with access to Thousand Islands natural beauty.

Late Spring through Early FallExplore Town
Chippewa Bay
⌖ 10.30 miles
Gateway Basecamp

Chippewa Bay, New York

A peaceful waterfront community offering classic Adirondack adventures with a focus on paddling, fishing, and lakeside relaxation.

Late Spring through Early FallExplore Town
Clayton
⌖ 11.17 miles
Gateway Basecamp

Clayton, New York

A vibrant river town offering a mix of water-based recreation, forest trails, and historic small-town charm on the edge of the Thousand Islands.

Late Spring to Early FallExplore Town
Upper Town Landing
⌖ 11.21 miles
Gateway Basecamp

Upper Town Landing, New York

A serene riverside gateway offering rich paddling routes and hiking escapes along the Hudson, blending quiet waters with rugged natural trails.

Late Spring to Early FallExplore Town
Gananoque
⌖ 12.10 miles
Gateway Basecamp

Gananoque, Ontario

A charming waterfront town serving as the gateway to the 1,000 Islands, offering diverse outdoor adventures across water and forested landscapes with a relaxed, welcoming atmosphere.

Late Spring to Early FallExplore Town
Expert-Led Wilderness Expeditions

Guided Experiences in Thousand Islands Marine National Park

Explore scenic backcountry routes and epic wilderness adventures with certified local mountain guides, naturalists, and outfitters.

12 bookable experiences

Outdoor Adventure: Boldt Castle & Two Nation Tour with Clayton Island ToursClayton, New York · 7.54 mi away
On the Water· Clayton Island Tours

Outdoor Adventure: Boldt Castle & Two Nation Tour with Clayton Island Tours

Discover the legendary Boldt Castle and stunning river vistas on a 3.5-hour boat tour with Clayton Island Tours. This intimate journey combines history, architecture, and sweeping scenery, offering a memorable outing along the U.S.-Canadian border. Join experienced guides as you cruise past waterfront mansions and the iconic Boldt Castle, learning stories of love and legacy amid the natural beauty of the Saint Lawrence River. Ideal for history lovers and adventure seekers alike, this tour provides a captivating glimpse into the region's maritime and architectural history. With opportunities to spot local wildlife and enjoy pristine waters, this trip delivers both relaxation and discovery. Perfect for families or anyone looking to add a touch of grandeur to their outdoor adventures, it’s a quintessential experience in northern New York.

about 3.5 hours

Explore this trip

Availability, pricing, meeting details, and fulfillment are provided by the applicable operator or booking partner.