Poros, a mountainous Greek island belonging to the Saronic Archipelago in the Ionian Sea, covers an area of almost fifty square kilometers. It actually consists of two smaller islands. Sphairia, i.e the promontory clearly visible in the waters of the gulf, and Kalaureia are now connected by a bridge. The Port of Poros is the largest town on the island. Formerly, the island was a place of worship of Poseidon, as evidenced by the remains of the temple located on one of the hills, there is also an archaeological museum. Currently, Poros can be reached by yacht, hydrofoil or ferry, also from the nearby port of Piraeus.