The term marsh is used to refer to those wet-type ecosystems that are characterized by a significant presence of water as well as low and surface-type vegetation that covers the water but does not dry it out. The marshes are always usually found in regions close to the sea and are considered to be depressions in the land in which the water from the sea or ocean arrives through the waves and the changes in the tides. Normally, the marshes are spaces in which there is a great variety of flora and fauna due to the favorable conditions of this ecosystem.
The marshes can be described as irregular territories in which the water from the movement of the sea is deposited as well as from the mouth of the rivers that end their course joining with the sea or ocean. It can be said that marshes are a type of intermediate territory between the ground or the mainland and the sea.
Due to the significant presence of water (which in some cases is not visible to the naked eye due to the vegetation), the marshes always have a humid climate, conducive to the development of numerous plant and animal species. In addition, they are especially useful areas for carrying out different types of agricultural and cultivation activities due to their fertility, although they are not useful for livestock and grazing activities.
The marshes generally have little relief that does not exceed ten meters, this being related to the fact that these ecosystems are almost always at sea level or very close to it. However, they can have important depressions in their land, which make up the spaces in which the water will later be deposited. Depending on the depth of the terrain, some marshes can become navigable.
