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
- Anemone Bommies - Lady Elliot Island
- Bait Reef (reef)
- Barolin Point Dive Site
- Black Island “WONDERWALL“ (wall)
- Blue Pearl Bay 2 (reef)
- Butterfly Bay (reef)
- Butterfly Bay “KEYHOLE“ (reef)
- CHIN LONG WEE - 0m (wreck)
- Conical Rocks Reef (reef)
- Coral Gardens - Lady Elliot Island (reef)
- Corroboree Reef (reef)
- Cruise Whitsundays Pontoon
- Dangerous Reef (reef)
- Dangerous Reef (reef)
- Dolphin Point
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
- Green Turtle (Chelonia mydas)
- Dugong (Dugong dugon) - Whales & Dolphins
- halodule (Halodule uninervis) - Seagrass & Algae
- seagrass (Halophila ovalis) - Seagrass & Algae
- gray mangrove (Avicennia marina) - Seagrass & Algae
- Paddle Grass (Halophila decipiens) - Seagrass & Algae
- Olive Ridley (Lepidochelys olivacea)
- Common Coral Trout (Plectropomus leopardus) - Reef Fish
- Hawksbill Turtle (Eretmochelys imbricata)
- Ward's Damsel (Pomacentrus wardi) - Reef Fish
- Rainford's Butterflyfish (Chaetodon rainfordi) - Reef Fish
- Blackedge thicklip wrasse (Hemigymnus melapterus) - Reef Fish
- Bullethead Parrotfish (Chlorurus sordidus) - Reef Fish
- Harlequin tuskfish (Choerodon fasciatus) - Reef Fish
- Banded maori wrasse (Cheilinus fasciatus) - Reef Fish
- Species code: Hn (Halophila spinulosa) - Seagrass & Algae
- Dusky Parrotfish (Scarus niger) - Reef Fish
- Golden Butterflyfish (Chaetodon aureofasciatus) - Reef Fish
- Longnose Butterflyfish (Chelmon rostratus) - Reef Fish
- Rainbow Parrotfish (Scarus flavipectoralis) - Reef Fish
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