Author 'Gipsy34' (Id 136585 ) : Another photo Gruissan surrounded by reeds ... the tall grass sometimes difficult to distinguish from its close relative the "giant reed" generally does not exceed 3. 5 m and grows mostly in wetlands, edges of ponds. These "big wet reeds" called "senile" in Narbonne are here an essential element of landscape lagoon. They are the "phragmitaies" or "reed." Their presence may reveal the existence of sources of fresh water flowing to the edges of ponds. These groups are popular refuges for many animals, including birds.