Blue Lagoon
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.
The Blue Lagoon is Rangiroa's excursion rather than a dive: a pool of impossible aquamarine sealed inside the atoll's southwestern rim, reached by a boat crossing that is half the experience. The water rarely tops a few meters, which is exactly why it glows. Blacktip reef sharks cruise the shallows in numbers (juveniles nursery here), sharing the flats with mullet, rays, and confident snapper while frigatebirds and noddies work the motu behind. Tours add a motu barbecue and time to wander sandbars. Divers should file it honestly under rest-day magic: fins, mask, and no tank required or wanted.
The moment you come for: Blacktip reef sharks in gin-clear shallows; the aquamarine pool and its bird-loud motu; a classic Tuamotu day out.
Topography: A natural lagoon-within-the-lagoon: sand flats and coral patches enclosed by a ring of motu
Entry: A day-trip crossing of about an hour to the atoll's far southwest rim; visits wade and snorkel the shallow pool and its motu.
Know before you splash
Hazards: Sunburn and coral cuts top the list; the crossing gets rough in wind and trips cancel in bad weather.
Conservation: The shallows are a shark nursery: wade calmly, feed nothing, and follow guides' instructions around resting animals.
Who you'll meet
Blacktip Reef Shark
Green Sea Turtle
Porcupinefish
"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)