Serifos is a Greek island of the Aegean Sea, located in the western Cyclades, south of Kythnos and northwest of Sifnos. The total surface of the island is 75.2 square kilometres (29.03 sq mi) and the population was 1,420 at the 2011 census. It is located about 72 nautical miles ESE of Piraeus.
In Greek mythology, Serifos is where Danaë and her infant son Perseus washed ashore after her father Acrisius, in response to an oracle that his own grandson would kill him, set them adrift at sea in a wooden chest. When Perseus returned to Serifos with the head of the Gorgon Medusa, he turned Polydektes, the king of Serifos, and his retainers into stone as punishment for the king's attempt to marry his mother by force.
In antiquity the island was proverbial for the alleged muteness of its frogs.During the Roman period, Serifos was a place of exile. After 1204 it became a minor dependency of the Venetian dukes of the Aegean Archipelago. In the late 19th century Serifos experienced a modest economic boom from exploitation of the island's extensive iron ore and copper deposits. The mines closed in the 1960s, and Serifos’ economy now depends on tourism and small-scale agriculture.