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The first thing to do to fully enter into the establishment of the meaning of the term estuary is to know its etymological origin. In this case we can determine that it is a word that is presented as a female version of the river, which derives from the Latin “rivus”, which can be translated as “watercourse”.

When he sea penetrates the coast because the coastline of a river basin is submerged, the geomorphological accident known as estuary . This is caused by the way it takes a river valley at the mouth of a River : the valley ends submerged under the ocean due to the increase in water level.

In simpler words, it can be said that the estuary is a arm of the sea that ends up entering the coast . The estuary, therefore, implies the existence of a Valley of a river that is flooded by the high level of the sea.

In the estuaries the water of the sea converges with the water of the river, since one or more rivers can flow into this body of water that is located in a coastal region and that is open to the sea.

The most common cause for the development of a river is the flooding of the valley due to rising sea levels. In some cases, however, the estuary can be created by a subsidence of the land. Although the estuaries are similar to the fjords, it must be borne in mind that these arise from the erosion that cause glaciers.

It should be noted that a estuary can house islets and coves . They usually have a funnel shape that widens until it reaches the sea.

It is possible to find estuaries in various parts of the world . In Spain, for example, the Arosa estuary , the Ferrol estuary , the Ría de Pontevedra , the Bilbao estuary and the Ría de Cubas . Mexico has the Ría Celestún and the Ria Lizards , Meanwhile in Argentina are the Ría del Tuyú (also known as Ría de Ajó ) and the Wanted Ria .

However, in addition to those mentioned, there are other equally important estuaries such as these:
-Ría de Huelva, which is located south of the Andalusian province of Huelva (Spain). It is very important in that in the early twentieth century there was the discovery in it of an important set of objects from the Bronze Age. Also its environment is really spectacular, if we consider the existence of the Monastery of La Rabida or the Natural Park of Marismas del Odiel.
-Ría de San Vicente. This is located in northern Spain, in Cantabria, and more exactly in the tourist municipality of San Vicente de la Barquera. It has become one of the most emblematic images of the town, because the famous bridge of San Vicente, which has semicircular arches, stands on that river.
-Ría de Ribadeo. In the Spanish autonomous community of Asturias is where this other enclave is located, which is considered a Natural Reserve. However, it should be noted that one of its parts is in Galician lands. The Rio Grande, the Suarón river and the Esquilo stream flow into it.

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