National Wetland Inventory Wetlands and Deepwater Map Code Diagram

This diagram shows the hierarchy of the Wetlands and Deepwater Habitats classification system, from System to Subclass, and includes special modifiers. Water regimes are not included in this diagram.

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Large pool of water surrounded by low tundra grasses under cloud covered sky.
The U.S. Fish and Wildlife Service is the principal federal agency tasked with providing information to the public on the extent and status of the nation’s wetland and deepwater habitats, as well as changes to these habitats over time.