Sideros (Greek: Σίδερος), is the outermost of a chain of two island-like peninsulas forming, with Itanos promontory, Cape Sidero. They are all three the summits of submarine elevations connected by rocky surface cols on which a road has been constructed to Cape Sidero Lighthouse, the elevated facsimile chapel of Saint Isidore, and Port Joannis, a cove of 2 fathoms (12 ft) (about 4 m). There are ruins of an ancient temple of Athena destroyed by a tsunami and facilities of the Kyriamadi Naval Station. Kyriamadi is the other island-like peninsula in the chain. Administratively the cape lies within the Itanos municipal unit, Sitia Municipality, Lasithi regional unit, and Crete region.