10-25m
    Rock Islands, Palau
    Ngerumekaol Spawning Area

    Ulong Channel

    Best months: Nov–Mar

    Protected Area

    Ngerumekaol Spawning Area

    Why dive here

    With 182+ marine species recorded in the area - including barracuda, lionfish, mandarin fish, napoleon wrasse and nautiluses - Ulong Channel offers some of Rock Islands's richest drift diving. Water ranges 29-30°C, warmest June, October, November.

    Best timeNov–Mar
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Lionfish, Mandarin Fish, Napoleon Wrasse and Nautiluses · 182+ species recorded
    Water29-30°C · warmest June, October, November
    CharacterDrift dive · max 10-25m
    StandoutExceptional marine biodiversity

    Ulong Channel isn't just a drift dive, it's a high-speed joyride through a natural aquarium. We love dropping in north of the channel, typically around 20 meters, and letting the current do all the work. It pulls you along a sandy bottom that rarely dips below 13 meters, past schools of spotted surgeonfish so thick they dim the light. Keep an eye out for batavian parrotfish chewing on coral and cleaner mimics darting around. The real magic happens on the channel walls. They’re absolutely packed with life, a constant parade of bicolour parrotfish, foxface, and tiny Queensland eviota. We've spent entire dives just hovering, watching the drama unfold. Look for the occasional cowry or sea olive tucked into a crevice. This is a dive that suits anyone who enjoys a thrilling drift and a relentless display of reef fish in a stunning, shallow setting. You’ll want to do it more than once; there’s just too much to take in on a single pass.

    Typical Ulong Channel Dive Profile

    5m10mSafety Stop0m10m max~60 min estimated bottom time

    Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.

    Safety Notes

    Drift dive - carry a surface marker buoy (SMB) and stay with your group. Brief the current direction before entry.

    Today05:5117:5012h 0m daylightGolden hour 17:23

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    Conditions

    Ocean conditions, forecast and tides for Ulong Channel

    Ulong Channel Ocean Conditions

    Monthly averages for Ulong Channel, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (7.2, 134.3) (4km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    30°C

    86°F · Range: 28.5–31.2°C

    Current Speed

    10.05 cm/s

    Direction: N (5.7°)

    Chlorophyll-a

    0.026 mg/m³

    Very clear (oligotrophic)

    Salinity

    33.62 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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