Thousand Islands National Park Thousand Islands National Park Thousand Islands National Park (established 1904), formerly known as the St. Lawrence Islands National Park, is located on the 1000 Islands Parkway in the Thousand Islands Region of the Saint Lawrence River. The islands are actually the worn-down tops of ancient mountains. This region, the Frontenac Axis, connects the Canadian Shield from Algonquin Park in Ontario to the Adirondack Mountains in New York. The park consists of 21 islands plus many smaller islets, 2 mainland properties and a visitor centre at Mallorytown, Ontario on the mainland. It is one of Canada's smallest national parks with a
Thousand Islands in the mid-1990s with the arrival of zebra mussels, which feed on algae. The water is so clear in some areas that a rocky bottom can be observed in of water. The area has several shipwrecks, and although most of them are over underwater, some are a mere down and can be seen from the surface. Prior to European colonization, the Thousand Islands region was home to, or visited by, members of the Iroquois Confederacy and Ojibwa people. Their name for the islands was "Manitouana" or the "Garden of the Great Spirit". The region was a part of the War