The stretch of open water between Corfu's southeastern coast and Paxos measures eleven nautical miles — a passage that ancient Greek traders navigated under sail, hugging the limestone cliffs of the Ionian archipelago. Modern catamaran services trace the same route, departing Corfu New Port at 09:00 and returning by early evening, carrying passengers toward an island whose marble-white coastline has remained largely unchanged since Venetian cartographers charted it in the fifteenth century. Paxos sits at the geological boundary where tectonic uplift exposed Mesozoic limestone, creating the steep eastern cliffs that rise directly from water exceeding one hundred metres in depth. The island's northern promontory shelters the Blue Caves — a network of sea-carved grottos where refracted sunlight turns the enclosed water a luminous cyan, a phenomenon dependent on angle, season, and the clarity of the Ionian basin itself. Catamaran cruises anchor offshore, allowing passengers to swim into the caves during calm conditions. The crossing typically includes a secondary stop at Antipaxos, two kilometres south, where Voutoumi Beach offers sand composed of pulverised shell fragments and visibility extending twenty metres below the surface. The route's appeal rests not in monumental architecture or museum collections but in the precision of its natural geometry — the way limestone folds into the sea, the abrupt transition from cobalt depths to turquoise shallows over submerged rock shelves. Day sailings offer deck space for observation, onboard commentary that situates the islands within their Venetian and British colonial history, and intervals for swimming or snorkelling at sites inaccessible by road. Paxos itself remains a working island, its interior planted with olive groves established under Venetian rule, its three harbours — Gaios, Lakka, Loggos — retaining the proportions of pre-industrial fishing ports. The catamaran crossing delivers access without requiring overnight accommodation, maintaining the separation that has preserved the island's scale and prevented the infrastructure expansion visible elsewhere in the Ionian chain.