Three kilometres northeast of Aguilas is la Isla del Fraile (Monk Island), so named thanks to the similarity of the island's silhouette to a monk's hood. The island has a small rocky beach and a very steep geography. The top of the island gives way to a sudden drop down to the sea on the island's south side. The island was inhabited by the Romans, who used it to export fish byproducts to Rome in amphorae. The remains of a Roman wall are still visible, as are a couple of structures of the early 20th century built by an eccentric British lord who lived on the island and used it for contraband purposes.