Krknjaši Bay earned its Blue Lagoon nickname in the early 2000s when Croatian tour operators began routing speedboats through the sheltered cove on Drvenik Veli's western coast. The lagoon sits in a natural basin where limestone bedrock reflects sunlight through seven to twelve metres of seawater, producing the turquoise gradient that now defines split boat tours Blue Lagoon itineraries across the central Dalmatian archipelago. No permanent structures stand on the shoreline — the bay remains accessible only by private vessel or organised excursion, a designation that has preserved water clarity levels comparable to the outer Vis channels despite rising visitor traffic since 2015. Today the site anchors the most frequently chartered route in the Split harbour departure schedule. Standard half-day excursions pair the lagoon with stops at Šolta's Nečujam inlet and the Maslinica waterfront, though premium operators extend southward to include Čiovo's Mavarstica beach or the stone-arch formations off Drvenik Mali. The appeal lies in the swim-stop model — vessels moor in open water rather than berthing at congested piers, allowing passengers to enter the bay directly from stern platforms while crew prepare onboard lunch service. Karst topography ensures the seabed drops steeply beyond the shoreline pines, creating snorkelling corridors along submerged ledges where damselfish and sea bream congregate in late spring and summer months. Operators favour rigid-hulled inflatables and fibreglass speedboats over larger catamarans, prioritising manoeuvrability in the bay's narrow approach channels and faster crossing times on the eighteen-nautical-mile outbound leg. Departure windows cluster between eight and ten in the morning to secure mooring space before midday flotillas arrive, a timing consideration reflected in the printed itineraries of adriatic speedboat excursions departing Matejuška and ACI Marina berths. The boat tour model has shifted Blue Lagoon commerce away from the land — no ticket booths or visitor centres operate on Drvenik Veli itself — and concentrated transaction infrastructure at the Split waterfront, where comparison boards now list fifteen competing routes during peak travel weeks in July and August. The lagoon's seasonal rhythm follows Adriatic water temperature cycles. Surface readings climb from sixteen degrees Celsius in May to twenty-four by mid-July, the threshold at which extended swim stops become standard across all split boat tours Blue Lagoon schedules. Autumn bookings thin after the first week of September, though operators maintain reduced-frequency service through late October when prevailing bura winds remain mild and visibility peaks under cloud-free skies.