Thousand Islands level year-round, and support at least two living trees. The Thousand Islands archipelago is located at the outlet of Lake Ontario at the head of the Saint Lawrence River. The region is bisected by the Canada–United States border and covers portions of Jefferson and St. Lawrence counties in the U.S. state of New York, in addition to parts of the United Counties of Leeds and Grenville and Frontenac County in the Canadian province of Ontario. Geologically, most of the islands are located where a branch of the Canadian Shield runs south across the river to join with the Adirondacks. The
Thousand Islands Railway Thousand Islands Railway The Thousand Islands Railway (originally Gananoque & Rideau Railway) was an long railway running from the town of Gananoque north to the Grand Trunk Railway (now CN) Toronto-Montreal mainline, just south of present-day Cheeseborough. The service ran for 111 years between 1884 and 1995. The rails were removed in October 1997. The railway was originally incorporated as Gananoque & Rideau Railway on 15 February 1871, but construction did not begin until 1883 due to lack of money. The town provided tax breaks and $10,000 in debenture financing to Rathbun's Bay of Quinte Railway and Navigation Company to