They are windmills that used to grind most of the cereals harvested on Formentera
"The small village with four small houses, and further up, some windmills; windmills whose wings are waiting for one of the eight winds to grind the few grain that Formentera gave its name "(From the poem" Formentera ", by Marià Villangómez).
Although the language professors are fairly unanimous in the fact that the name Formentera does not originate from the Latin frumentus, cereal, the drought of the island scarcely allows the cultivation of other plants than that of corn, and so on the bulk of the fields of this island is nothing other than cereals. The transformation of the hard seeds into something edible takes place in different phases. The absence of streams and rivers exclude the existence of water mills. There are some mills driven by the power of the animals; they are known as "molinos de sangre" (blood mills) and there are many small mills, operated by hand, are a mill in every traditional house. Among all the mills, to grind the grain into flour, the ever-fascinating windmills stand out. In the beginning of the 19th century two mills, the Molí d'en Mateu and the Molí d'en Jeroni, were erected at the top of Sant Francesc Xavier in the east, known as Sa Mirada or Sa Miranda , both of which were still in operation shortly after the Spanish Civil War.
The six windmills of Formentera are included in the cultural heritage catalog of Formentera.