Comino Island, a 3.5-square-kilometre limestone plateau midway between Malta and Gozo, hosts fewer than a dozen permanent residents yet receives tens of thousands of visitors each summer, nearly all arriving by sea. The Blue Lagoon, a shallow bay on Comino's northwestern shore, owes its name to waters so saturated with dissolved calcium carbonate that sunlight refracts through gradients of cobalt, azure, and jade depending on depth and cloud cover. The lagoon averages 2.5 metres deep across most of its expanse, with a sandy bottom that reflects light upward and amplifies the blue spectrum visible from above. St Paul's Bay boat trip to blue lagoon departures trace a six-kilometre route northwest from Buġibba Jetty, passing St Paul's Islands—two uninhabited limestone stacks where tradition places the apostle's shipwreck in AD 60—before rounding Comino's southern cliffs. The journey takes 25 to 40 minutes depending on vessel type, with catamarans offering shade canopies and larger deck space while traditional luzzu-style boats maintain lower passenger counts. Most operators include a secondary stop at Crystal Lagoon, a narrower inlet on Comino's eastern flank where rock formations create natural swimming corridors and snorkelling visibility routinely exceeds 30 metres. Comino itself was named for the cumin seeds once cultivated across its terraced slopes by the Knights of St John, who maintained a small garrison at the 17th-century Santa Marija Tower to deter pirate landings. The island became a quarantine station in the 1800s, then a de facto nature reserve after depopulation in the mid-20th century. Today, it serves as a habitat for endemic Maltese wall lizards and migratory seabirds, with land access restricted to a single hotel and a cluster of walking trails. Daily st paul's bay boat trip to blue lagoon tours operate from 08:00 to 18:00 year-round, with frequencies peaking between May and October when water temperatures range from 21 to 27 degrees Celsius. Full-day itineraries typically add Gozo stops, incorporating the Inland Sea at Dwejra or the red-sand beach at Ramla Bay. Half-day cruises focus solely on Comino's twin lagoons, allocating two to three hours for swimming and snorkelling before returning to Buġibba. The no-fee entry model means costs attach only to boat transport, which operators price from €25 for basic shuttle service to €60 for premium catamaran cruises with open bar and onboard lunch.