Castaway Island - Iron Bottom Sound

Forest (N) on Klein Bonaire is a site we’ve always held a soft spot for, particularly if you’re looking for a relaxed, shallow dive. Forget the deep stuff; the magic here truly happens in the first 15 metres. You’ll drop onto a gentle slope, immediately enveloped by stands of Mustard Hill Coral and Great Star Coral, forming what feels like an actual underwater forest. It’s not just a name; the coral here feels denser, more established than many other sites around Klein. Keep your eyes peeled for the smaller residents. We’ve had fantastic luck spotting Banded Basslets darting into crevices and the surprisingly elegant Molly Miller blennies perched on coral heads. The Caribbean Reef Squid often glide by in the bluer water, their colours shifting with mesmerizing speed. And yes, the black corals are definitely a draw, adding an unusual texture to the vibrant reefscape. This site is perfect for photographers, or anyone who just wants to slow down and truly absorb the details of a healthy Caribbean reef. We’d suggest going in the morning; the light filtering through the shallower corals is just beautiful.

Location: Iron Bottom Sound, Solomon Islands, Central & South Pacific
Coordinates: -8.334800, 157.266400
Type: reef

Marine Protected Area: Dunde (Shark Point)

Best Time to Dive in Iron Bottom Sound

The warmest water temperatures in Iron Bottom Sound occur in January, averaging 30.5°C. The coolest conditions are in December at 30.5°C.

Monthly Water Temperatures

January: 30.5°C (air: 26.9°C)
February: 30.5°C (air: 26.7°C)
March: 30.5°C (air: 26.7°C)
April: 30.5°C (air: 26.8°C)
May: 30.5°C (air: 26.9°C)
June: 30.5°C (air: 26.5°C)
July: 30.5°C (air: 26.5°C)
August: 30.5°C (air: 26.3°C)
September: 30.5°C (air: 26.5°C)
October: 30.5°C (air: 26.7°C)
November: 30.5°C (air: 26.7°C)
December: 30.5°C (air: 26.9°C)

Nearby Dive Sites in Iron Bottom Sound

Nearest Dive Centres to Castaway Island

Marine Life in Iron Bottom Sound

Home to 415 recorded species including 320 reef fish, 29 hard corals, 18 sea snails & nudibranchs, 16 sea cucumbers, 7 seagrass & algae, 5 clams & mussels.

Notable Species

Blue-lined Surgeonfish (Acanthurus lineatus) - Reef Fish
Bristle-toothed Surgeonfish (Ctenochaetus striatus) - Reef Fish
Blue and Gold Fusilier (Caesio caerulaurea) - Reef Fish
Boring Clam (Tridacna crocea) - Clams & Mussels
Orange-lined Triggerfish (Balistapus undulatus) - Reef Fish
Dusky Parrotfish (Scarus niger) - Reef Fish
beautiful fusilier (Caesio teres) - Reef Fish
Blue-lined Tang (Zebrasoma scopas) - Reef Fish
Rainbowfish (Halichoeres hortulanus) - Reef Fish
Redfin Butterflyfish (Chaetodon lunulatus) - Reef Fish
Burrowing urchin (Echinometra mathaei) - Sea Urchins
Small giant clam (Tridacna maxima) - Clams & Mussels
Kihikihi (Zanclus cornutus) - Reef Fish
Latticed Butterflyfish (Chaetodon rafflesii) - Reef Fish
Bleeker's Parrotfish (Chlorurus bleekeri) - Reef Fish
Butterfly fish (Chaetodon vagabundus) - Reef Fish
Black-barred Surgeonfish (Acanthurus nigricauda) - Reef Fish
Mimic Surgeonfish (Acanthurus pyroferus) - Reef Fish
Triangular Butterflyfish (Chaetodon baronessa) - Reef Fish
Wrasse (Labroides dimidiatus) - Reef Fish

Recommended Packing List for Castaway Island

Based on average water temperature of 30.5°C.

Shorty or Rashguard - warm 30°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