Systems

System	Country	Region	Surface area (Km²)	OEC	ASSETS grade
Alamitos Bay	United States	U.S. Pacific	2	Moderate Low
Albemarle Sound	United States	U.S. South Atlantic	2496.98	Low
Alsea River	United States	U.S. Pacific	9	Moderate Low
Altamaha River	United States	U.S. South Atlantic	39.1	Moderate Low
Anaheim Bay	United States	U.S. Pacific	5	Moderate
Apalachee Bay	United States	U.S. Gulf of Mexico	1773	Moderate Low
Apalachicola Bay	United States	U.S. Gulf of Mexico	593.7	Low
Aransas Bay	United States	U.S. Gulf of Mexico	524.04	Moderate
Atchafalaya/Vermilion Bays	United States	U.S. Gulf of Mexico	2226.99	Moderate Low
Baffin Bay	United States	U.S. Gulf of Mexico	239	High
Barataria Bay	United States	U.S. Gulf of Mexico	852	Moderate
Barnegat Bay	United States	U.S. Mid-Atlantic	182	High
Belfast Lough	United Kingdom	Irish Sea	130	Moderate
Biscayne Bay	United States	U.S. South Atlantic	702	Low
Blue Hill Bay	United States	U.S. North Atlantic	316.4	Low
Bogue Sound	United States	U.S. South Atlantic	274	Moderate Low
Boston Harbor	United States	U.S. North Atlantic	185.96	Moderate
Brazos River	United States	U.S. Gulf of Mexico	12	Moderate Low
Breton/Chandeleur Sound	United States	U.S. Gulf of Mexico	4301	Low
Broad River	United States	U.S. South Atlantic	243	Low
Buzzards Bay	United States	U.S. Mid-Atlantic	638.99	High
Calcasieu Lake	United States	U.S. Gulf of Mexico	260	High
Caloosahatchee River	United States	U.S. Gulf of Mexico	67	Moderate Low
Cape Cod Bay	United States	U.S. North Atlantic	1439	Moderate
Cape Fear River	United States	U.S. South Atlantic	100	Moderate Low
Carlingford Lough	Ireland	Irish Sea	49	Low
Casco Bay	United States	U.S. North Atlantic	426.97	High
Central San Francisco/San Pablo/Suisun Bays	United States	U.S. Pacific	837.85	Moderate Low
Changjiang (Yangtze) Estuary	China	East China Sea	51000	High
Charleston Harbor	United States	U.S. South Atlantic	84.98	Moderate High
Charlotte Harbor	United States	U.S. Gulf of Mexico	502	Moderate Low
Chesapeake Bay Mainstem	United States	U.S. Mid-Atlantic	6973.998	High
Chester River	United States	U.S. Mid-Atlantic	196	Moderate Low
Chincoteague Bay	United States	U.S. Mid-Atlantic	335	High
Choctawhatchee Bay	United States	U.S. Gulf of Mexico	340	Moderate High
Choptank River	United States	U.S. Mid-Atlantic	411	High
Columbia River	United States	U.S. Pacific	615	Moderate Low
Connecticut River	United States	U.S. Mid-Atlantic	42	Moderate
Coos Bay	United States	U.S. Pacific	44.1	Moderate Low
Coquille River	United States	U.S. Pacific	9	Moderate Low
Corpus Christi Bay	United States	U.S. Gulf of Mexico	571	High
Damariscotta River	United States	U.S. North Atlantic	53.05	Moderate
Delaware Bay	United States	U.S. Mid-Atlantic	2070	Moderate Low
Delaware Inland Bays	United States	U.S. Mid-Atlantic	72	High
Drakes Estero	United States	U.S. Pacific	4	Moderate High
East Mississippi Sound	United States	U.S. Gulf of Mexico	654.6	Moderate
Eel River	United States	U.S. Pacific	22.02
Elkhorn Slough	United States	U.S. Pacific	3	High
Englishman/Machias Bay	United States	U.S. North Atlantic	225	High
Firth of the Clyde	United Kingdom	Northeast Atlantic	2500	Moderate High
Florida Bay	United States	U.S. Gulf of Mexico	1663	High
Galveston Bay	United States	U.S. Gulf of Mexico	1455.98	Low
Gardiners Bay	United States	U.S. Mid-Atlantic	511.98	Moderate High
German Bight (inner)	Germany	North Sea	300	Moderate High
German Bight (outer)	Germany	North Sea	400	Moderate Low
Grays Harbor	United States	U.S. Pacific	235	High
Great Bay	United States	U.S. North Atlantic	47.02	Low
Great South Bay	United States	U.S. Mid-Atlantic	383	Moderate Low
Guadiana	Portugal	Northeast Atlantic	19.5	Moderate
Hampton Harbor	United States	U.S. North Atlantic	3	Low
Hood Canal	United States	U.S. Pacific	396	Moderate High
Huangdun Bay	China	East China Sea	90	Moderate
Hudson River/Raritan Bay	United States	U.S. Mid-Atlantic	799.04	High
Humboldt Bay	United States	U.S. Pacific	64	Moderate High
Indian River	United States	U.S. South Atlantic	866	Moderate
James River	United States	U.S. Mid-Atlantic	640	Low
Jiaozhou Bay	China	Yellow Sea	400	Low
Kennebec/Androscoggin River	United States	U.S. North Atlantic	76	Moderate
Klamath River	United States	U.S. Pacific	6
Lake Borgne	United States	U.S. Gulf of Mexico	744	Low
Lake Pontchartrain	United States	U.S. Gulf of Mexico	1878.989	High
Larne Lough	United Kingdom	Irish Sea	8
Long Island Sound (1991)	United States	U.S. Mid-Atlantic	3400	High
Long Island Sound (2002)	United States	U.S. Mid-Atlantic	3400	Moderate
Lough Foyle	United Kingdom	Irish Sea	186	Low
Lower Laguna Madre	United States	U.S. Gulf of Mexico	1308.03	High
Maryland Inland Bays	United States	U.S. Mid-Atlantic	54	High
Massachusetts Bay	United States	U.S. North Atlantic	768	High
Matagorda Bay	United States	U.S. Gulf of Mexico	1114.95	Moderate Low
Mermentau River	United States	U.S. Gulf of Mexico	450
Merrimack River	United States	U.S. North Atlantic	16	Low
Mission Bay	United States	U.S. Pacific	8	Moderate Low
Mississippi River	United States	U.S. Gulf of Mexico	981	Low
Mobile Bay	United States	U.S. Gulf of Mexico	1079	Moderate
Mondego estuary	Portugal	Northeast Atlantic	10.81	Moderate Low
Monterey Bay	United States	U.S. Pacific	545	Moderate Low
Morro Bay	United States	U.S. Pacific	8	High
Muscongus Bay	United States	U.S. North Atlantic	200.797	Moderate Low
Narragansett Bay	United States	U.S. Mid-Atlantic	415.9	Moderate Low
Narraguagus Bay	United States	U.S. North Atlantic	205.8	Moderate High
Nehalem River	United States	U.S. Pacific	9	Moderate Low
Netarts Bay	United States	U.S. Pacific	10	Moderate Low
Neuse River	United States	U.S. South Atlantic	456	High
New Jersey Inland Bays	United States	U.S. Mid-Atlantic	278	Moderate Low
New River	United States	U.S. South Atlantic	88.02	High
Newport Bay	United States	U.S. Pacific	5.1	Moderate High
North Ten Thousand Islands	United States	U.S. Gulf of Mexico	390	Low
North/South Santee Rivers	United States	U.S. South Atlantic	17.998	Moderate Low
Ossabaw Sound	United States	U.S. South Atlantic	88.1	Low
Pamlico Sound	United States	U.S. South Atlantic	4680	High
Pamlico/Pungo rivers	United States	U.S. South Atlantic	452	High
Passamaquoddy Bay	United States	U.S. North Atlantic	148
Patuxent River	United States	U.S. Mid-Atlantic	141.99	High
Penobscot Bay	United States	U.S. North Atlantic	992	Low
Pensacola Bay	United States	U.S. Gulf of Mexico	477.03	Moderate
Perdido Bay	United States	U.S. Gulf of Mexico	129	Moderate High
Plum Island Sound	United States	U.S. North Atlantic	15	Low
Port Orchard Sound	United States	U.S. Pacific	92	High
Potomac River	United States	U.S. Mid-Atlantic	1260	Moderate High
Puget Sound	United States	U.S. Pacific	1080	Moderate
Rappahannock River	United States	U.S. Mid-Atlantic	377	Low
Ria de Aveiro	Portugal	Northeast Atlantic	60	Moderate
Ria Formosa	Portugal	Northeast Atlantic	49.5	Moderate Low
Rogue River	United States	U.S. Pacific	2	Low
Rookery Bay	United States	U.S. Gulf of Mexico	35.01	Low
Sabine Lake	United States	U.S. Gulf of Mexico	265	Low
Saco Bay	United States	U.S. North Atlantic	49	Moderate High
Sado estuary	Portugal	Northeast Atlantic	179.7	Low
San Antonio Bay	United States	U.S. Gulf of Mexico	587.6	Moderate Low
San Diego Bay	United States	U.S. Pacific	44	Moderate
San Francisco Bay	United States	U.S. Pacific	487.5	Moderate High
San Pedro Bay	United States	U.S. Pacific	57	Low
Sanggou Bay	China	Yellow Sea	140	Low
Santa Monica Bay	United States	U.S. Pacific	547	Moderate High
Sarasota Bay	United States	U.S. Gulf of Mexico	124	High
Savannah River	United States	U.S. South Atlantic	121	Moderate
Sheepscot Bay	United States	U.S. North Atlantic	107.03	High
Siletz Bay	United States	U.S. Pacific	7	Low
Siuslaw River	United States	U.S. Pacific	10.1	Moderate Low
Skagit Bay/Whidbey Basin	United States	U.S. Pacific	622
South Puget Sound	United States	U.S. Pacific	448.996	High
South Ten Thousand Islands	United States	U.S. Gulf of Mexico	227	High
St. Andrew Bay	United States	U.S. Gulf of Mexico	252	Moderate
St. Andrew/St. Simons Sounds	United States	U.S. South Atlantic	175.9	Moderate Low
St. Catherines/Sapelo Sounds	United States	U.S. South Atlantic	187.9
St. Helena Sound	United States	U.S. South Atlantic	203	Moderate Low
St. Johns River	United States	U.S. South Atlantic	684.7	High
St. Marys River/Cumberland Sound	United States	U.S. South Atlantic	64	Moderate Low
Stono/North Edisto Rivers	United States	U.S. South Atlantic	69	Moderate Low
Strangford Lough	United Kingdom	Irish Sea	149	Moderate Low
Suwannee River	United States	U.S. Gulf of Mexico	165	Moderate Low
Tampa Bay	United States	U.S. Gulf of Mexico	901.1	High
Tangier/Pocomoke Sounds	United States	U.S. Mid-Atlantic	1057	Moderate
Tejo estuary	Portugal	Northeast Atlantic	307.8	Moderate Low
Terrebonne/Timbalier Bays	United States	U.S. Gulf of Mexico	1262	Moderate Low
Tijuana Estuary	United States	U.S. Pacific	1	High
Tillamook Bay	United States	U.S. Pacific	38	Moderate Low
Tomales Bay	United States	U.S. Pacific	28.8	Moderate High
Umpqua River	United States	U.S. Pacific	24	Low
Upper Laguna Madre	United States	U.S. Gulf of Mexico	591	High
Venice Lagoon	Italy	Mediterranean Sea	45
Wells Bay	United States	U.S. North Atlantic	1
West Mississippi Sound	United States	U.S. Gulf of Mexico	1580.999	Moderate Low
Willapa Bay	United States	U.S. Pacific	355	High
Winyah Bay	United States	U.S. South Atlantic	89.04	Moderate
Yaquina Bay	United States	U.S. Pacific	14	Low
York River	United States	U.S. Mid-Atlantic	206	Low

Number of systems in ASSETS: 157
Total area covered: 134600.4370 km²

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