Thousand Islands – Frontenac Arch is one of four ecoregions of the Mixedwood Plains. The Thousand Islands in the Saint Lawrence River have a distinctive flora and fauna and are a part of the biological corridor. The bedrock is mostly gneiss, granite and marble, more than a billion years old. The Frontenac terrain is the youngest of the Ontario portions of the arch, dated at 1.2 billion years old. These rocks were once part of a large mountain chain of the ancient supercontinent of Rodinia. There is also a meteor crater near Holleford, where the shield meets the limestone plains of southeastern Ontario. The area
Thousand Islands Railway Street crosses the Gananoque River. The waterfront station became a restaurant after passenger service ended, but was destroyed by fire in 1990; the Arthur Child Heritage Museum was built on the site. The former right-of-way is readily visible on satellite imagery, and is now a hiking trail. The Gananoque Junction station remains on Station Road which is west of Hiscocks Road. 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