El Tostón Tower, located in El Cotillo within the municipality of La Oliva in Fuerteventura, is a 18th-century coastal defense structure built around 1700 by military engineer Claudio de L'Isle to protect the island against Barbary pirates. The circular stone tower, constructed from locally quarried stone, features two levels with a stone staircase and housed iron cannons on the upper floor, once capable of accommodating twelve soldiers. Recognized as a historic-artistic monument in 1949, the tower represents the strategic importance of Fuerteventura as a trading port during the Atlantic era. Today it serves multiple purposes: housing exhibitions on the island's maritime history, functioning as a tourist information center for La Oliva, and showcasing works by local artists, while offering visitors commanding views of the coast and Atlantic waters.