Wonderful Indonesia guide reinforcing the 15-30 m visibility band and the March-to-October best-time window.
Colorful reef-current dive
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Coral Mountain Bay is a colorful reef-current dive where the reef on the left shoulder is the main attraction and the fish traffic is the bonus. The site combines hard and soft corals, nudibranchs, and macro life with the chance of whitetip sharks and larger fish in moving water, so it works best for divers who want an active but not chaotic advanced reef. The slope-to-plateau shape gives it a more sculpted feel than a pure wall, and the clearer windows make the coral color pop. This is a polished Maratua reef dive, not a current-hook spectacle.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Best Season
March to October, when seas are calmest and visibility is at its best.
Typical Conditions
A steep reef leads into a sandy plateau, with moderate current, strong visibility, and colorful coral structure on the left shoulder.
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Current can be present and may bring larger fish; plan the dive accordingly.
Access Restrictions
Boat access through the archipelago dive network is the practical route; treat it as an advanced reef dive, not a casual shore entry.
Community notes to help plan your visit.
Scuba Diving
Reef dive typically conducted with the left shoulder to the reef.
Freediving
The depth and current profile make this a scuba-first site rather than a freedive target.
Snorkeling
The reef profile can be interesting from the surface on very calm days, but it is better known as a diver site than a snorkel stop.
Species commonly reported at this site, with direct links into their wildlife guides.
Community dive logs and visit reports for this site.
Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Wonderful Indonesia guide reinforcing the 15-30 m visibility band and the March-to-October best-time window.
Derawan travel guide with a May-to-September best-time window.
Derawan archipelago guide with the March-to-October calm/clear window and the broader resort-boat network.
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