Rock Islands, Palau
    Ngemelis Island Complex

    The Big Drop Off

    Best months: Nov–Mar

    Protected Area

    Ngemelis Island Complex

    Why dive here

    With 182+ marine species recorded in the area - including barracuda, lionfish, mandarin fish, napoleon wrasse and nautiluses - The Big Drop Off offers some of Rock Islands's richest wall 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
    CharacterWall dive
    StandoutExceptional marine biodiversity

    The Big Drop Off is exactly that, a wall that just keeps going, down to an almost ridiculous 285 metres. We love it because it delivers on both the macro and the pelagic, right from the first fin kick. Drop in and you’re immediately enveloped by the shallows, a flurry of fusiliers and parrotfish darting through the soft corals. Our favourite part has to be the overhangs, look closely and you’ll spot Twinspot Hawkfish perched like tiny sentinels, or the shy Longface Emperor peeking out. As you drift down, the wall itself becomes the star, a tapestry of massive sponges and plate corals, each crevice home to something new – maybe a Fluted Clam, or a Bicolor Angelfish flashing its electric hues. Keep one eye on the blue, though. Blacktip sharks often cruise by, and we’ve even been lucky enough to spot a Chambered Nautilus making its slow, deliberate journey. It’s a site that rewards patience and a keen eye, perfect for divers who appreciate both the grandeur of a deep wall and the intricate beauty of the reef’s smaller residents.

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    Conditions

    Ocean conditions, forecast and tides for The Big Drop Off

    The Big Drop Off Ocean Conditions

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

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    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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