Arno’s Underwater Reef
Protected Area
TAMAN WISATA PERAIRAN KEPULAUAN RAJA AMPAT
Why dive here
With 236+ marine species recorded in the area - including blacktip reef sharks, manta rays, mobula rays (devil rays), pygmy seahorses and sea turtles - Arno’s Underwater Reef offers some of Raja Ampat's richest reef diving. Water ranges 29-30°C, warmest May, November, December.
Arno’s Underwater Reef can be a proper rush, especially when the current picks up. We’d suggest starting close to the drop-off; otherwise, you’ll be working hard to cover ground. Expect a steady drift past walls dense with coral, dropping to around 22 meters for recreational divers, though the reef itself keeps going. We’ve spotted pygmy seahorses tucked into gorgonian fans here and, if you’re lucky, a manta ray might cruise by in the blue. Keep an eye out for Denise's pygmy seahorse and perhaps a leatherback sea turtle. The dive ends shallow in a pretty soft coral garden, a nice calm finish after the channel's energy.
Safety Notes
Strong currents typical this month (avg 35 cm/s). Good buoyancy control essential.
Nearest Dive Centres to Arno’s Underwater Reef
Dive shops near Arno’s Underwater Reef
Mantastic Scuba Paradise
Papua Explorers Resort
Mangkur Kodong
Lumba Lumba
Delvin
Koranu Fyak Homestay
Reviews for Arno’s Underwater Reef
Conditions
Ocean conditions, forecast and tides for Arno’s Underwater Reef
Arno’s Underwater Reef Ocean Conditions
Monthly averages for Arno’s Underwater Reef, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (-0.5, 130.6) (0km away)
October Averages
Sea Temperature
30°C
86°F · Range: 29.2–30.9°C
Current Speed
34.71 cm/s
Direction: NW (311.5°)
Chlorophyll-a
0.138 mg/m³
Clear water
Salinity
34.33 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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