Best Estuary
The San Francisco Bay is a significant estuary situated along California’s west coast. It's notable as the largest of its kind in the United States, formed by the Golden Gate Strait’s connection to the Pacific Ocean. This complex ecosystem supports diverse marine life and provides crucial habitat fo...
Established on the Texas Gulf Coast in 1937, it is the primary wintering ground for the endangered whooping crane, whose wild population recovered from fewer than 20 individuals in the mid-20th century.
iSimangaliso Wetland Park encompasses Lake St. Lucia, a significant South African lagoon within the Indian Ocean. This vast estuarine system is recognized as a UNESCO World Heritage site due to its exceptional biodiversity including high populations of hippos and crocodiles. It’s a critical habitat...
Crantock Beach is a large sandy beach located near Newquay in Cornwall, England. It is backed by a substantial system of sand dunes and bordered by the tidal Gannel Estuary, which is popular for activities like kayaking. Sections of the beach and surrounding headland are managed by the National Trus...
Morro Bay is a shallow coastal estuary located on the central coast of California. It is flanked by a sandspit that separates the bay from the Pacific Ocean and provides shelter for a substantial harbor used by commercial fishing fleets. The most prominent geological feature is Morro Rock, a 576-foo...
The Sacramento-San Joaquin Delta is an expansive inland river delta and tidal estuary in northern California formed by the convergence of the Sacramento and San Joaquin rivers. The waters eventually flow into the San Francisco Bay, making it the largest estuary on the West Coast of North America. It...
Tampa Bay is a large natural harbor and estuary located along the Gulf Coast of Florida, opening directly into the Gulf of Mexico. It is the central geographic feature of the Tampa Bay area, surrounding major cities including Tampa, St. Petersburg, and Clearwater. The bay supports a heavily populate...
Delaware Bay is a major estuary on the Northeast coast of the United States where the Delaware River meets the Atlantic Ocean, bordering New Jersey and Delaware. It is recognized as a crucial stopover site for millions of migratory shorebirds, particularly the red knot, which rely on the eggs of spa...
The Marismas del Odiel is a significant tidal estuary located in Andalusia, Spain. This Ramsar wetland site showcases exceptional biodiversity and ecological productivity within a large salt marsh system. It supports a wide range of plant and animal life including numerous migratory bird species. Th...
The Knysna Lagoon is a coastal estuary located in South Africa’s Garden Route region. It's notable as the habitat of the critically endangered Knysna seahorse and features dramatic sandstone Heads cliffs. The lagoon supports diverse marine life and attracts tourists interested in wildlife observatio...
The Meghna River is one of the most significant and widest rivers in Bangladesh, forming a crucial part of the Ganges-Brahmaputra-Meghna delta system. It originates in the Surma-Meghna river system before flowing southwest to meet the mighty Padma River near Chandpur. After this massive confluence,...
The Nisqually National Wildlife Refuge protects the Nisqually River delta where the river enters southern Puget Sound near Olympia, Washington. Established in 1974, it encompasses tidal mudflats, salt marsh, freshwater wetlands, riparian woodland, and restored estuarine habitat. These environments p...
The Baie de Somme is a large natural estuary located on the English Channel coast of northern France, in the Hauts-de-France region. It is characterized by its extensive sandbanks, salt marshes, and mudflats, making it an important site for migratory birds and a habitat for seal colonies, including...
The Akkerman Fortress is a large historical citadel and defensive complex located in Bilhorod-Dnistrovskyi, Ukraine, near the Dniester Estuary and the Black Sea coast. Its construction spans the 13th to 15th centuries, incorporating walls built during the Genoese and Moldavian periods. The fortress...
Narragansett Bay is a prominent estuary and inlet located in the state of Rhode Island, extending inland from the Atlantic Ocean. It is the largest estuary in the New England region, covering over 147 square miles and containing numerous islands, including Aquidneck Island. The bay forms the primary...
The Marismas de Santoña, Victoria y Joyel are a protected complex of estuaries, tidal flats, salt marshes, and wetlands on the Cantabrian coast of northern Spain. Designated a Ramsar wetland of international importance in 1994, the area provides feeding and resting habitat for numerous migratory wat...
The Medway Estuary and Marshes form an extensive coastal wetland area located in Kent, England, where the River Medway meets the Thames Estuary. Recognized internationally as a Ramsar site in 1993, the ecosystem comprises mudflats, saltmarshes, and freshwater grazing marshes. This unique environment...
Hangzhou Bay is a major funnel-shaped inlet of the East China Sea located in Zhejiang Province, China, situated immediately south of Shanghai. It receives the waters of the Qiantang River and is renowned for having one of the world's largest tidal bores, which can create walls of water reaching seve...
Berney Marshes and Breydon Water comprise a Royal Society for the Protection of Birds (RSPB) nature reserve located in Norfolk, England. The reserve encompasses Breydon Water, a large tidal estuary at the confluence of the Yare and Waveney rivers, alongside extensive grazing marshes. These intertida...
Humboldt Bay is the second-largest natural bay in Northern California and represents the largest enclosed coastal bay in the state north of San Francisco. It is formed by a complex system of tidal mudflats, sloughs, and marshes, providing vital habitat for regional fish populations and migratory bir...
The Hooghly River is a distributary of the Ganges that flows through the Indian state of West Bengal, passing the city of Kolkata before emptying into the Bay of Bengal. It is formed by the bifurcation of the Ganges and is navigable for oceangoing vessels as far north as Kolkata. The river's mouth a...
The Gulf of Guayaquil is a broad inlet of the Pacific Ocean on the coasts of Ecuador and northern Peru. The Guayas River system empties into the gulf through an estuarine landscape containing channels, islands, mudflats, and mangrove forests. Guayaquil, Ecuador's largest city and principal commercia...
Hamford Water is a coastal embayment and extensive saltmarsh system located in Essex, England. The area is a designated Ramsar site, a Site of Special Scientific Interest, and a Special Protection Area due to its diverse intertidal habitats. It supports internationally significant populations of wat...
The River Liffey is a 125-kilometer waterway in eastern Ireland that flows through the center of Dublin, the country's capital. It physically divides the city into its Northside and Southside and is spanned by several notable bridges. Among these is the Ha'penny Bridge, a historic cast-iron pedestri...
The James River is a major waterway in the U.S. state of Virginia, extending approximately 547 kilometers across the state. It originates in the Blue Ridge Mountains and flows southeast into the Chesapeake Bay at Hampton Roads. The river passes through Richmond and the historic site of Jamestown, th...
The Swale is a narrow tidal channel in Kent, England, separating the Isle of Sheppey from the mainland and connecting the Thames Estuary with the waters toward the east Kent coast. Its surrounding landscape includes mudflats, salt marsh, grazing marsh, and freshwater ditches that provide feeding and...
The Gulf of Nicoya is a large inlet of the Pacific Ocean on the western coast of Costa Rica, separating the Nicoya Peninsula from the country's central mainland. Its estuarine waters receive several rivers and support mangroves, mudflats, islands, fisheries, and other productive coastal habitats. Pu...
Tijuana Slough National Wildlife Refuge is a coastal salt marsh preserve located in Imperial Beach, Southern California, near the Mexican border. Established in 1980 and administered by the U.S. Fish and Wildlife Service, it protects one of the largest remaining salt marshes in Southern California....
The Hackensack Meadowlands is a large ecosystem of estuaries and wetlands located in northeastern New Jersey, near New York City. Formed by the lower Hackensack River, the area features brackish marshes, tidal creeks, and mudflats that provide crucial habitat for migratory birds and regional wildlif...
San Pablo Bay is a large tidal estuary forming the northernmost extension of the San Francisco Bay system in California. It receives substantial freshwater inflow from the Sacramento and San Joaquin rivers via the Carquinez Strait. The bay is relatively shallow, characterized by broad mudflats that...
