The Thousand Islands are a group of 1,864 islands located in the St. Lawrence River between southeastern Ontario in Canada and northern New York in the United States. Thousand Islands National Park is located on the Canadian side and is spread across 21 of these islands and a few different areas on the mainland. While the islands are inaccessible in the winter, there are a few hiking trails on the mainland section of the park that remain open year-round.

Located near the Saint Lawrence River, Thousand Islands National Park is one of Canada’s smallest national parks. The park consists of three sections along the mainland: Mallorytown Landing, Jones Creek and Landon Bay, and 21 islands. While most of the park is only accessible by boat, there are a few hiking trails that can be accessed on the mainland.