Thousand Islands National Park

Thousand Islands National Park (established 1904), formerly known as the St. Lawrence Islands National Park, is a Canadian National Park 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 total area of 24.4 square kilometres (9.4 sq mi).

Much of the park is only accessible by boat. Trail systems can be found on the mainland along the 1000 Islands Parkway at Mallorytown Landing, Jones Creek and Landon Bay. There are picnic, camping and oTENTik facilities on several islands and at Mallorytown Landing. Mallorytown Landing is a day use area that offers a large parking, a boat ramp, several oTENTiks, picnic gazebos, playground, animal exhibits, travelling exhibits, and interpreters.

The Frontenac Arch Biosphere Reserve, in which the park is located, is known for being the most biodiverse region in Canada.