2019 Map of Cape Vincent South OE W

About this map

The international boundary between Canada and the United States of America cuts diagonally across the open waters where the Saint Lawrence River begins its course from Lake Ontario. This maritime environment is defined by submerged hazards and isolated landmasses along the Jefferson County border. The eastern edge of the map identifies the western shoreline of Grenadier Island, a significant feature within the river's mouth. Navigational landmarks are sparse in these deep waters, though the presence of the Allan Otty Shoal indicates the rugged underwater topography that ship captains must navigate as they transition from the lake into the river's main channel. The map serves as a clear record of the modern hydrography and political boundaries of this critical waterway junction.