The Thousand Islands Bridge (French: Pont des Mille-îles) is an international bridge system over the Saint Lawrence River connecting northern New York in the United States with southeastern Ontario in Canada. Constructed in 1937, with additions in 1959, the bridges span the United States-Canada border in the middle of the Thousand Islands region, from which it derives its name. The bridges all carry two lanes of traffic (one in each direction) with pedestrian sidewalks, and is administered by the Thousand Islands Bridge Authority, an international agency.