Blue Hole
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily, so treat everything here as planning ranges.
Gozo's Blue Hole is the Mediterranean's most famous ten meters of water: a sheer-sided pool in the Dwejra limestone that funnels divers down to an archway at about 8 m and releases them onto open blue wall. Since the Azure Window collapsed in a March 2017 storm, the seaward slope holds its enormous remains: clean-edged blocks the size of buildings, already colonizing with algae and schooling damselfish, a dive now known as Azure Reef. A chimney through the rock and the small cave at the hole's base complete the circuit. Mornings belong to divers; by mid-day the pool doubles as the local swimming hole.
The moment you come for: The archway exit into blue, Azure Window boulder field, chimney swim-through
Topography: A collapsed limestone sinkhole opening through an underwater archway onto walls and the tumbled remains of the Azure Window
Entry: A walk across Dwejra's fossil-studded limestone shelf to a natural rock pool entry; boots and calm seas make it comfortable, and swell makes it unwise.
Know before you splash
Hazards: Swell surges through the entry pool and archway in anything but calm weather; boulder terrain drops quickly past 30 m.
Conservation: Within the Dwejra protected area; the collapsed Window's stone is part of the site's story and stays untouched.
Who you'll meet
"Charted here" species were listed by our editors from the sources on this page. Counts are GBIF occurrence records: observations logged within about 5 km of the charted position since 1990, matched only against the species in our catalogue. They show what has been seen there, not a promise of what you will see.
For photographers
Wide angle: ★★★★★ · Macro: ★★☆☆☆ (editors' 1–5 rating of what this site gives each style of shooting)