Major Watersheds (Feature Service)

The 32 major watersheds covering Massachusetts as defined by the USGS Water Resources Division and the MA Water Resources Commission. Unlike the Major Basins layer, the watersheds in this layer extend beyond the state boundary to include the full extent of either the full watershed or a full USGS sub-basin. See full metadata. Map service is also available.本数据集收录由美国地质调查局（United States Geological Survey，USGS）水资源分部与马萨诸塞州水资源委员会划定的覆盖马萨诸塞州的32个大型流域。与“大型流域图层（Major Basins layer）”不同，本图层内的流域会跨越州界，以完整覆盖整个流域或完整的USGS次级流域。详见完整元数据。同时提供地图服务。