Many different habitat types are found in and around estuaries, including shallow open waters, freshwater and salt marshes, swamps, sandy beaches, mud and sand flats, rocky shores, oyster reefs, mangrove forests, river deltas, tidal pools, and … Because they completely block off the estuary where they are placed, tidal barrages have … Is the Ob River in Russia the largest estuary in the world? Below is the largest tidal barrage in the world, which is located on the La Rance estuary in France. It is the largest of more than 100 estuaries in the United States and third largest in the world. The estuary is the largest in Africa and boasts, among other attractions, the world’s largest forested sand dunes, which reach up to 600 feet. National Estuary Program; O. For example, New York is located at the mouth of the Hudson River estuary. The Chesapeake Bay is an estuary: a body of water where fresh and salt water mix. Many sources describe Chesapeake Bay as the world’s third-largest estuary. The Ob River (Roushie: Обь), an aa Obi, is a major river in western, Siberia, russia an is the world’s fift longest river. It is the wastrenmaist o the three great Siberie rivers that flae intae the Arctic Ocean the ither twa bein the Yenisei River a the Ob River). Of the 32 largest cities in the world, 22 are located on estuaries. The plant supplies 90% of the energy for the region, the equivalent of 30,000 homes. Swamps along the border of the lake, and “sponge” areas are fed by water seeping through the dunes; these provide critical refuges to … There are three good candidates: Saint Lawrence River in Canada, with 140 km wide and long estuary. The largest estuary in the world is the Saint Lawrence River(1,197 km long), which connects the Great Lakes to the Atlantic Ocean. These 10 largest rivers in the world by volume have been providing people living on their banks with food, water and means of transport for centuries. We’ve even seen it described (incorrectly) as the largest estuary in the world. Of the 32 largest cities in the world, 22 are located in estuaries. The Bay itself is about 200 miles long, stretching from Havre de Grace, Maryland, to Virginia Beach, Virginia. It has also been described as the largest estuary in the United States. In relation to surface area, the largest estuary in the world is the Gulf of St. Lawrence, but in relation to shoreline length, the largest estuary is.... See full answer below. Others consider it the second largest. Old Woman Creek National Estuarine Research Reserve; S. Sapelo Island National Estuarine Research Reserve This page was last edited on 30 December 2016, at 22:58 (UTC). As ecosystems, estuaries are under threat from human activities such as pollution and overfishing.