Protected Natural Area
Tordera river has its source at 1,100 metres above the sea level in Sant Marçal (in Montseny massif), between Turó de l’Home and Matagalls. After approximately 61 km it flows into the sea forming a small delta between the towns of Malgrat de Mar and Blanes and works as a natural frontier that separates Girona and Barcelona provinces.
A delta is a landform, mostly triangular, that forms from the deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or standing water, for instance, the sea. The most relevant deltas in Catalonia, going by size, are Ebro Delta, Llobregat Delta and Tordera Delta.
The mouth of Tordera river is a space of high ecological value that harbours a great number of habitats and the diverse flora and fauna of marshes. It is a strategic spot for birds to overwinter and rest during their migrations and it is one of the richest sources of biodiversity and one of the biggest attractions in the area. Moreover, its beauty is changing year after year, due to the action of the sea currents and river flow that create and transform the mouth of the river.