Rauto'Anui

Rauto’Anui is a pass drift dive in the Raiatea-Taha’a barrier reef system, French Polynesia. The Tahitian name translates roughly to “the large current” or “big channel flow,” reflecting the powerful tidal circulation that defines this site.

Overview

Rauto’Anui is one of the productive pass dives within the shared Raiatea-Taha’a barrier reef. The pass cuts through the barrier reef and funnels tidal exchange between the ocean and the lagoon, with the strongest flows on the incoming tide attracting the full complement of Polynesian pass-dive species. The channel depth reaches 25 metres at the deepest point before shoaling into the lagoon. Visibility on incoming oceanic water is typically 30–40 metres, with water temperatures of 27–28°C.

What to Expect

Grey reef sharks are the primary attraction, moving through the pass on the tidal current in groups of 10–30. Blacktip reef sharks are present in smaller numbers, particularly toward the lagoon side of the pass. Eagle rays and manta rays are seasonally encountered. Schools of barracuda and bigeye trevally sweep through the channel in formation, while smaller reef fish shelter in crevices in the channel walls. The pass walls themselves are encrusted with hard corals and sea fans, providing habitat for hawkfish, trumpetfish, and moray eels that inhabit the edges of the main current. The combination of reef life and pelagic activity makes for a varied and exciting drift.

Conditions

• Best season: April–November
• Visibility: 30–40 m on incoming tide
• Current: Strong (2–4 knots); incoming tide required
• Water temperature: 27–28°C
• Entry: Boat drift dive; timed to tidal cycle

Tips

As with all Society Islands pass dives, timing the dive to a reliable incoming tide is non-negotiable for optimal conditions. Carry an SMB for safe boat pickup at the lagoon exit. Raiatea and Taha’a operators run this pass as part of multi-site dive programs — typically paired with a lagoon reef dive.

Sources: Te Moana Diving - Raiatea & Taha’a, Polynesia Paradise - Raiatea Diving, Hemisphere Sub - Raiatea. Last updated 2026-05-30.