MassGIS 2003 Massachusetts Major Drainage Basins (Polygons) (March 2003)
- This datalayer, produced by MassGIS, contains polygons representing the 28 major drainage basins of Massachusetts as defined by the USGS Water Resources Division and the MA Water Resources Commission. (See also the Major Drainage Basins (Arcs) datalayer).
- Office of Geographic and Environmental Information (MassGIS)
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