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EPA Surf Your Watershed
Allows users to locate, use, and share environmental information about their state and watershed
National Wetlands Inventory
Provides information on the characteristics, extent, and status of the Nation's wetlands and deepwater habitats and other wildlife habitats; contains a variety of maps and data including the interactive Wetlands Mapper
NOAA ENC - Electronic Navigational Charts
Vector data sets that support all types of marine navigation.
NOAA Raster Chart Products
Various NOAA chart products that portray water depths, coastlines, dangers, aids to navigation, landmarks, bottom characteristics and other features, as well as regulatory, tide, and other information.
US Geological Survey Water Resources of the United States
Maps, data and other information about the Nation's water resources.
Citing maps and atlases
a Style Guide, 2nd ed.
Map and Government Information Library - Reference
Style guides for citing maps, atlases and related resources in all formats.