Io Reef - Coral Sea

Io Reef, out in the Coral Sea, offers a straightforward look at a healthy outer reef system. We’ve found good visibility here on most trips, letting you appreciate the sheer scale of the coral structures. It’s primarily a drift dive, best suited for those comfortable with some current, letting you glide past schools of fusiliers and the occasional reef shark patrolling the drop-offs. Come for the wide-angle reef scape rather than specific macro finds.

Location
Coral Sea, Australia, Australasia
Coordinates
-20.700000, 149.133330
Type
reef

Marine Protected Area: Repulse

Best Time to Dive in Coral Sea

The warmest water temperatures in Coral Sea occur in March, averaging 28.3°C. The coolest conditions are in August at 21.2°C.

Monthly Water Temperatures

  • January: 27.9°C
  • February: 28.3°C
  • March: 28.3°C
  • April: 27.2°C
  • May: 25.0°C
  • June: 23.0°C
  • July: 21.6°C
  • August: 21.2°C
  • September: 22.3°C
  • October: 24.3°C
  • November: 26.3°C
  • December: 27.7°C

Nearby Dive Sites in Coral Sea

Nearest Dive Centres to Io Reef

Marine Life in Coral Sea

Home to 120 recorded species including 73 reef fish, 30 hard corals, 8 seagrass & algae, 3 other, 2 sharks & rays, 1 whales & dolphins.

Notable Species

Recommended Packing List for Io Reef

Based on average water temperature of 25.2°C, currents 5 cm/s.

  • Shorty or Rashguard - warm 25°C water needs minimal exposure protection
  • Mask - essential for every dive
  • Fins
  • BCD - buoyancy compensator
  • Regulator - your most safety-critical piece of gear
  • Dive Computer - tracks depth, time, and NDL
  • Surface Marker Buoy (SMB) - essential for boat pickups
  • Dive Torch - useful for crevices and colour at depth
  • Underwater Camera - capture your diving memories