Krknjaši Bay earned its nickname from the mineral-rich seabed that refracts sunlight into gradients of cobalt, turquoise, and jade. The shallow basin lies on the southern shore of Drvenik Veli, an island 14 nautical miles west of Split, sheltered by vertical karst walls that reach 120 metres. No road connects the lagoon to any settlement — every visitor arrives by vessel, a geographic accident that has preserved the site from overdevelopment. The bay's contours were shaped by millennia of wave action against Cretaceous limestone, dissolving calcium carbonate into a fine white sediment that settles across the floor. Water depth rarely exceeds four metres, allowing sunlight to penetrate to the substrate and illuminate the suspended particles. Local operators began running Split boat trips Blue Lagoon excursions in the early 2000s, recognising the site's appeal to day-trippers seeking swimming conditions unavailable on the mainland coast. By 2010, the route had become a standard circuit, pairing the lagoon with neighbouring islands Šolta and Čiovo for half-day itineraries. Today, the majority of departures operate between April and October, when Adriatic water temperatures range from 18 to 26 degrees Celsius. Speedboat operators typically allocate 60 to 90 minutes of anchored time, sufficient for swimming, snorkelling, and cliff-edge photography. The surrounding rock faces provide natural shade during midday hours, a feature absent from open beaches. Party cruise formats layer onboard music and refreshments onto the same routing, targeting younger demographics. Three-island configurations add Maslinica or Nečujam as secondary stops, extending total journey time to five or six hours. The absence of permanent structures — no jetties, cafés, or visitor centres — means the experience remains elemental: water, stone, light. Conservation status falls under Croatia's coastal zone protections, which prohibit construction within 100 metres of the high-tide line. This regulatory framework ensures the lagoon retains its character as a purely maritime destination, accessible only to those willing to cross open water.