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 Border Crossing inspection stations on Heart Island and at Cape Vincent, NY, and Canada has seasonal vessel inspection stations at Rockport, Ontario and Gananoque, Ontario, and both Canada Border Services Agency (CBSA) and the U.S. Customs and Border Protection (CBP) will travel to selected ports and marinas to conduct inspections upon request. Thousand Islands Border Crossing The Thousand Islands Border Crossing connects the towns of Alexandria Bay, New York and Ivy Lea, Ontario on the Canada–US border. The crossing is via the international span of the Thousand Islands Bridge. The Thousand Islands bridge, which was completed in 1938, is actually a system