Manta Ray Bay - Coral Sea

Peach Grove at Great Mercury Island is one of those spots we wish we could keep to ourselves. The beach itself is stunning, and the diving matches. At 13m max depth, it’s a brilliant site for newer divers or anyone who just wants a relaxed, easy dive. The real draw here is the mix of habitats: kelp forests that sway with the surge, patches of reef, and sandy gutters. We always find something interesting, from the big Oblique-swimming Triplefins darting around to the Short-tail Stingrays that often glide over the sand. It’s also a nursery, so keep an eye out for baby crayfish tucked into crevices – we’ve seen sooty shearwaters here too, diving from above. Visibility averages 9m, which is decent for the area, and we often find the conditions are calmest in the morning. It’s not about huge pelagics here, but the smaller, more intimate encounters.

Location
Coral Sea, Australia, Australasia
Coordinates
-20.061100, 148.956900
Type
reef

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 Manta Ray Bay

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 Manta Ray Bay

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

Frequently Asked Questions

What are the typical diving depths at Manta Ray Bay, especially for manta ray encounters and general reef dives?
Manta Ray Bay offers varied diving depths, suitable for different preferences. You can enjoy shallow dives around a maze of bommies, with the possibility of exploring the outskirts at 14-16m. While the general maximum depth is listed as 15m for these areas, more experienced divers can drop down a steep slope to 30m. The site is named Manta Ray Bay, but the provided data does not specify depths for live manta ray encounters.
Beyond manta rays, what other marine life and underwater features can divers expect to see at Manta Ray Bay?
Beyond the namesake, Manta Ray Bay is teeming with diverse marine life and interesting underwater features. Divers can expect to encounter the famous Maori Wrasse "GEORGE", alongside giant trevallies, batfish, and masses of fusiliers. Keep an eye out for whitetip reefsharks on deeper dives, and discover various nudibranchs, reef fish, and moray eels among the maze of bommies and along the steep slope. Don't forget to check out the unique Mantaray statues.
How challenging is the diving at Manta Ray Bay, and is it suitable for beginner or advanced divers?
Diving at Manta Ray Bay is rated as intermediate difficulty. While it offers suitable shallow dives around bommies for less experienced divers, the option to drop down a steep slope to 30m suggests that it can also cater to more advanced divers seeking deeper exploration. Therefore, it's generally best suited for divers with some experience, though parts of the bay may be accessible to confident beginners.
What is the best time of year to dive at Manta Ray Bay for optimal conditions and manta ray sightings, including mating season?
The provided data for Manta Ray Bay does not include information regarding the best time of year for optimal diving conditions or specific seasons for manta ray sightings, including their mating season. For details on when to dive in the Coral Sea, please consult our When to Dive guide.
What scuba diving certifications are required or recommended for diving at Manta Ray Bay?
While the provided data does not explicitly state specific certification requirements for Manta Ray Bay, its intermediate difficulty rating suggests that an Open Water Diver certification is a minimum. An Advanced Open Water certification is recommended for exploring the deeper sections down to 30m. Always check with your local dive operator for their specific requirements.
What are the typical currents and water conditions, including visibility and temperature, at Manta Ray Bay dive sites?
At Manta Ray Bay, divers can expect an average visibility of 11m, offering clear views of the vibrant reef. However, the provided data does not include specific information regarding typical currents or water temperatures for this dive site. For more comprehensive details on water conditions in the Coral Sea, it's advisable to consult local dive operators.