Shelters to keep boats safe from the unpredictable wrath of the sea. The sheltered boats are small in size, and are used for fishing for family consumption or for transporting small objects. They are located at different points along the coast.
Most of the coves that are even slightly protected from the strong waves of the sea feature shacks with their greased, polished wood guides or slipways sloping down to the water. The shacks are made of stone with a more or less elaborate roof: some are entirely made of wood, often driftwood brought in by the sea to the coast. They provide shade to the "llaüts" and boats, which are hauled out of the water along the slipway equipped with juniper wood rails and ties on which the sides of the hull rest. The boat is hauled out with the help of pulleys or hoists and a winch at the highest part of the dock. Experience from violent storms has taught where best to build these shelters for boats. Even so, in years of very heavy seas, one still hears of some dry dock or other being swept off to sea by the waves. The sea takes its own tolls even if they are on dry land. For that reason they can be considered as ephemeral architectures, exposed to the elements more than any other. The dry docks ("escars") are listed as a Bien de Interés Cultural. Noteworthy are the ones of Es Caló and Torrent de s'Alga.
The moderner of the two impressive lighthouses on Formentera
At the far southern tip of the island, Barbaria recalls the presence of the African coast far out to sea. For the safety of mariners, this lighthouse was built, raised on a rough landscape of rocks and wind-blown shrubs.