This tower, 13.5 m high, is part of the network of fortifications erected along the coast in the 16th century to prevent the constant incursions of Barbary pirates.
The truncated cone-shaped circular tower has two superimposed bodies, the lower one acting as a buttress of the structure.
The access door to its interior is elevated from the base. Two machicolations defend the access door. It emphasizes the coat of arms of Carlos V, with 4 bars, crown of the old Kingdom of Valencia and the double-headed eagle of the Austria. In the interior the different levels are communicated by an opening, which is accessed by means of a mobile staircase or simple rope.
There is evidence of another tower located in the current lighthouse of Sant Antoni, in addition to the tower of L’Almadrava. The towers had visual communication, although they also used other means, such as signals with mirrors, fire, etc. They had guards who were in charge of the custody of the towers, as well as of eventual transfers to other towers or citadels in case of danger.
Its name comes from its curious “gerro” or “pitxer” (vase) shape.