batch_auto_20260713 202607131256465730 BOEM ESP geoESPIS ESPIS@boem.gov Bureau of Ocean Energy Management Submarine Canyons of the United States Outer Continental Shelf Atlas CSA Ocean Sciences Inc. CSA Ocean Sciences Inc. The purpose of this study was to assist the Bureau of Ocean Energy Management in the preparation of environmental documents and to facilitate improved environmental management by developing one depository of maps and information on major submarine canyons of the Outer Continental Shelf (OCS). To accomplish this, submarine canyons were inventoried and delineated using a methodology consistent with terrestrial watershed mapping. A criteria-based algorithm generated spatial polygons used to calculate canyon slope, length, and depth. A concurrent literature review was conducted, which provided the notable facts for each canyon. The three canyon geometries were identified: 1) isolated and narrow relative to length, 2) isolated and wide relative to length, and 3) canyon systems (many canyons occurring conterminously). A distinct methodology was needed to delineate each of these canyon scenarios and eliminate surrounding seafloor from the definition of canyon boundaries. 164799 U.S. Department of the Interior, Bureau of Ocean Energy Management, Environmental Studies Program https://doi.org/10.13039/100012475 M0119F0009 10.67297/9A1E3D https://boem.gov/awardpages/100285