RM stands for RIVER MOUTH.
Before entering fully into the meaning of the term mouth, we are going to know its etymological origin. In this case we can establish that it derives from Latin, since it is the result of the sum of several components of said language:
-The prefix “des-”, which is used to indicate the investment of a share.
-The “en-” component, which means “inside”.
-The noun “bucca”, which can be translated as “mouth”.
-The suffix “-adura”, which is used to indicate “result”.
The place where a river drains or enters another, a lake or the sea, is called a mouth. The mouth can take different forms depending on the characteristics of the terrain.
In this part of the course, the flow of water reaches the place where it ends. The mouth may even extend underwater through a canyon or sedimentation site.
The mouth, by dragging fluvial sediments, can form a delta. In these cases the river is divided into a large number of arms, forming channels and islands. The Orinoco delta, for example, is the mouth of this river that begins and ends in Venezuelan territory but also crosses regions of Colombia.
The Danube River, which is one of the most important in the entire European continent, flows into the Black Sea through what is known as the Danube Delta, which is located between the Romanian lands of Dobrogea and the Ukrainian lands of Odessa. This delta has just over 3,400 square kilometers and is considered the largest and best preserved of the rivers that exist in Europe.
When the mouth of a river takes place in the sea, an estuary can develop. In this type of mouth an exchange between the fresh water of the river and the salt water of the sea takes place. The Thames Estuary, to cite one case, occurs in the area where this river empties into the North Sea.
Another geographical feature that a mouth can cause is the estuary. In this case, the river basin has steep slopes and the sea ends up entering the coast due to the movement of the tides, causing the river valley to remain submerged. A well-known estuary is that of Bilbao, at the mouth of the rivers Ibaizábal, Nervión and their tributaries in the Cantabrian Sea.
In Spain, without a doubt, much is said about the mouth of the Guadalquivir River, since it is in an area of great beauty and natural value. Specifically, it empties into the Atlantic Ocean through an estuary that is located between the Cadiz town of Sanlúcar de Barrameda and the Huelva municipality of Almonte.
Likewise, it should be noted that between this estuary and Seville there are the famous Guadalquivir marshes, which have an area of about 2,000 square kilometers and some of which form part of the relevant Doñana National Park, which has been declared Heritage of humanity by unesco.
Finally, it should be noted that the idea of mouth can allude to the opening of a path: “At the mouth of this street there is a beautiful square”, “The mouth of the tunnel was blocked by snow”.