This polyline shapefile depicts land and offshore boundary water indicators, including a partial selection of key 200-mile nautical limits. Limited attributes of type of boundary: disputed, treaty, and median lines, These data are represented at 1:10,000,000 scale. This layer is part of the Natural Earth Collection (v.2.0.0)., Natural Earth is a public domain map dataset available at 1:10, 1:50 and 1:110 million scales. Featuring tightly integrated vector and raster data, with Natural Earth you can make a variety of visually pleasing, well-crafted maps with cartography or GIS software., This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Patterson, Tom, Kelso, Nathaniel Vaughn (2012). World Maritime Indicators, 1:10 million (2012). North American Cartographic Information Society. https://purl.stanford.edu/fg520br3842 (dataset)