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The 400
square kilometer Anacostia watershed exhibits ecological and
physical diversity. The watershed extends into two physiographic
provinces and three political jurisdictions. Roughly mirroring
the boundary between Montgomery and Prince George's County,
Maryland, the fall line delineates the surface contact between
the Piedmont and Coastal Plain provinces. There are three
major drainage areas in the watershed: the Northwest Branch,
the Northeast Branch, and the tidal drainage. The tidal portion
of the Anacostia converges with the Potomac River near the
southern tip of the District of Columbia. Along the course
of the river, a number of small Coastal Plain streams contribute
directly to the tidal river, although most of these streams
are now enclosed in storm sewer drainage systems.
For a
more detailed description of the watershed, including information
on the watersheds' forested areas,
hydrology, and landuse,
please see our section on the natural
history of the watershed.
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DID YOU KNOW?
-The
Anacostia River has both free-flowing and freshwater tidal
regions.
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