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This menu provides options to search watershed boundaries defined by:
Major Watersheds: the Albemarle and Pamlico Sounds, Chesapeake Bay, Columbia River Basin,
Delaware Bay, Delaware River Basin, Great Lakes, Long Island Sound, Lower Columbia River Basin,
Mississippi-Atchafalaya River Basin, Mobile Bay, Puget Sound, San Francisco Bay, and Tampa Bay. Many of
these watersheds consist of several HUC-12 codes. Maps of these watersheds are available in About the Data.
USGS Watersheds: The US Geological Survey classifies watersheds in the US and Caribbean into 21 regions, represented by
a 2-digit Hydrologic Unit
Large Aquatic Ecosystems (LAEs) Program: EPA's Office of Wetlands, Oceans, and Watersheds classifies LAEs to
include multiple small watersheds and water resources within a large geographic area that provides
significant resources or services, such as food supply, recreation and tourism, groundwater recharge, flood
management, air purification, nutrient cycling, and wildlife habitat.
National Estuaries Program(NEP): The NEP identifies
nationally significant estuaries of the US for protection and restoration. EPA administers the NEP, but
program decisions and activities are carried out by committees of local government officials, private
citizens, and representatives from other federal agencies, academic institutions, industry, and estuary
user - groups. Estuaries are selected for inclusion in the program through a nomination process. There are
currently 28 estuary programs implemented in the U.S.
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