Zavikon Island refers to either the larger or the pair of islands in the Thousand Islands archipelago on the St. Lawrence River between New York and Ontario, two kilometres southeast of Rockport, Ontario and about 200 meters north of the international boundary. As confirmed by various USGS and US Department of Defense maps, Zavikon Island is located in Canadian territory and belongs to the Leeds and Grenville municipal unit.
The smaller and more southeasterly of the pair of islands is sometimes called Little Zavikon Island. It has a US-Canada Boundary Commission reference monument, from which, along with other reference monuments on the shore and islands, surveying measurement are used to calculate the international boundary line turning points in the waterway (in this case, about 140 meters southsoutheast of the southern tip of Little Zavikon Island as shown on the largest scale USGS map of the area.
A popular but incorrect tale among local guides is that the larger island is in Canada, while "Little Zavikon Island" is in the United States, and the footbridge between them is the "shortest international bridge in the world"   
In 1985, the islands hosted the first Zavikon Conference organized by the Dräger Foundation.
- "ONTERM GeoNames Index: Zachary Islands: Zigzag Island". Government of Ontario. Retrieved 2007-10-03.
- "Geographical Name Search Service (search for Zavikon Island)". Canadian Geographical Names Natural Resources Canada. Retrieved 2007-10-03.
- Clarke, Jay (July 17, 1983). "Retreat to the river on the St. Lawrence islands". The Philadelphia Inquirer. p. I09. Retrieved 2007-10-03.
- Chan, Elise D. (2004). Jefferson County. Arcadia Publishing. p. 58. ISBN 978-0-7385-3547-0.
- "The Venice of America". The Hindu Business Line. March 13, 2000. Retrieved 2007-09-09.
- Shortest International Bridge, Twelve Mile Circle, retrieved 2011-10-15
- Dräger Foundation
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- "The World's Shortest International Bridge." Atlas Obscura
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