Spilia, Greek for “cave,” is a largish area of swimming rocks, paved in places with concrete platforms, on the west corner of Hydra Harbor up by the canons. Bathers at Spilia, the closest public “beach” to Hydra Town, will enjoy the deep, clear, azure water as well as access to the Spilia Café, with outdoor seating and fabulous views of the sea, the mainland, and Hydra Harbor.