In 1999 the Posidonia meadows between the islands of Ibiza and Formentera were declared a World Heritage Site by UNESCO

“Ibiza, Biodiversity and Culture



One of the surprises awaiting the visitor to our islands is the sight of the incredible transparency of the sea water. The main reason for this is the presence in our waters of an aquatic plant, prolific in the Mediterranean, which has characteristics similar to land plants: Posidonia Oceanica has roots, stalks, leaves and fruits. Its leaves release into the sea up to 20 litres of oxygen per day per square metre of
seabed covered.

These underwater fields are of great ecological importance and constitute the climax community of the Mediterranean Sea. The remains of Posidonia deposited on the beaches protect the coastline from erosion. In addition to this, among its fronds live many animal and vegetable organisms that find nourishment and protection within the meadows. The presence of posidonia is considered a good bioindicator of the quality of the marine coastal waters.

In the past, Posidonia leaves were used as insulation in the roofs of typical Ibicencan houses, as bedding for cattle, and for the packing of fragile materials. A study is currently underway into its use for the production of biogas.