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The Great Lakes St. Lawrence River System, from Lake Ontario headwaters to L'Ile-Saint-Regis Island, is covered by this geospatial dataset. It contains vector polygons and lines representing political and jurisdictional human-use resources, part of a larger Environmental Sensitivity Index (ESI) database characterizing sensitivity to oil spills. The data was created by the National Oceanic and Atmospheric Administration (NOAA) and last updated in March 2026.
Primary file format is PDF, which may require conversion or specialized GIS tools for spatial analysis.