The Thousand Islands
The Thousand Islands are a group of more than 1,800 islands in the St. Lawrence River, straddling the border of the U.S. and Canada. A fashionable retreat for the elite in the late 19th century, today the area is a hub for outdoor activities. It’s home to elaborate island mansions such as the German-style Boldt Castle on Heart Island, and Singer Castle on Dark Island, with its Gothic windows and secret passageways.
New to the 1000 Islands? Download the official travel guide to help you plan your trip. Popular activities and attractions are included below.
Boldt Castle, Hart Island, Alexandria Bay
Singer Castle, Dark Island, Chippewa Bay
Frederick Remington Museum, Ogdensburg
Thousand Islands Museum, Clayton
Thousand Islands Art Center, Clayton
Antique Boat Museum, Clayton
Heritage Museum of the Thousand Islands, Gananoque
St. Lawrence Wine Trail
Uncle Sam Boat Tours, Alexandria Bay
Clayton Island Tours, Clayton
Canadian Boat Tour Lines
Alex Bay 500 Mini Golf & Go Karts, Alexandria Bay
Champagne Balloon Adventures, Alexandria Bay