Estuaries and rocky beaches are "guarded" by brown and black bears, gray wolves and cougars.
They are poor swimmers and despite their name, they inhabit fresh water as well as estuaries.
Plankton found in the estuaries nourish organisms all the way up the food chain.
There are dams all around the country, guarding all main river estuaries and sea inlets.
Defra said the European Commission had "adopted" the estuaries a year ago, but the decision had been made "formal".
BBC: Welsh estuaries are granted special conservation status
Both cities were built on estuaries, allowing the constant yet changing mixture of fresh and salty water that oysters love.
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Before pollution and over harvesting, oyster reefs protected coastlines in estuaries by stabilizing sediments and softening wave impacts near shorelines.
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Also, "the estuaries here are a nursery ground, literally a nursery ground, for the entire fish population in this area, " Bossart said.
My background is in numerical modeling of rivers, lakes, reservoirs, and estuaries.
The new status for the Severn and Dee estuaries comes after a request from the Department for Environment, Food and Rural Affairs (Defra).
BBC: Welsh estuaries are granted special conservation status
Hurricane Katrina gave Hanson's precast products an endorsement when four of a series of five bridges on estuaries leading into Mississippi were wiped out.
Communities along the estuaries on the east coast in Angus, Tayside, Fife, Falkirk, Edinburgh, East Lothian and the Borders are covered by the service.
However, things are a little more complicated when it comes to coastlines in the vicinity of inlets, such as river mouths, lagoons and estuaries.
Nature Trek offers a seven-night, full-board "Cruising the Great Bear Rainforest" trip, which includes daily shore excursions to explore the forests, estuaries and coastlines on foot.
Analysing these data revealed that estuaries and coastlines are less able to maintain, for example, water quality, as the number of species found within them declines.
The region can be visualized as a rootlike labyrinth of narrow inlets, estuaries, and bays reaching south to the state capital, Olympia, 200 miles inland from the Pacific Ocean.
And in Guyana and Suriname, coastal farmers irrigating with water from river estuaries have had to stop: because of the rivers' weak flow, it was sea-water.
But summertime thunderstorms are not delivering the up to 2 feet of rainfall forecasters say is needed to break the drought and flush estuaries of salt water.
In addition, says the report, sharks are threatened by high levels of bycatch and by destruction of bays and estuaries that are important nursery grounds for their young.
Both estuaries are important areas for migratory fish.
BBC: Welsh estuaries are granted special conservation status
And while oysters regionwide remained 17% below 2007-09 figures, the company says that the flooding that hit the region in 2011 has been blamed for some of that downturn, again by dumping more fresh water into the coastal estuaries.
The Mount Kuwol Biosphere Reserve, situated on the west coast of the Democratic People s Republic of Korea and 100 kilometres south-east of Pyongyang, consists of a 954 meter-high mountain, adjacent coastal wetlands, lagoons and river estuaries, and agricultural areas.
Example: In 2003 Tom's of Maine began donating to the Oregon-based River Network, a nonprofit dedicated to making the public aware that 50% of America's drinking water comes from rivers, and yet 40% of all rivers, lakes and estuaries are too dirty even for fishing or swimming.
The biggest concern we have, actually, are the marshes, the estuaries, the wetlands, where if you start seeing that oil seeping in, that not only can kill oyster beds and other vitally important seafood and ecosystems, but even the repair efforts in those areas can actually destroy the ecology in the region.
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So not only do you have the economics of some of the most -- as the fishermen told the President -- some of the most important estuaries in our country, but you also have -- obviously these marshes represent the physical barrier that protects the greater part of Louisiana, particularly New Orleans, from bigger storms and hurricanes.
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We had a discussion about the oil spill in the Gulf and the important measures that are being taken both in capping the well, in making sure that we are dealing with the consequences on the shorelines and estuaries and bays across the Gulf, and also making sure that ordinary Americans who are being devastated economically are compensated properly.
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Those are the same reasons President Obama mobilized EPA and other federal agencies to revitalize cleanups in the Chesapeake Bay and the Great Lakes, and why we are recommitting to our work on other great waterbodies such as Puget Sound, Lake Tahoe, the San Francisco Bay Delta, as well as our oceans, estuaries and precious wetlands like the Florida Everglades.
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