Sponge Reef
Conditions & tides
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
Sponge Reef lies off Maratua, one of the atolls in the Derawan archipelago along the coast of East Kalimantan, Indonesia. This part of the Celebes Sea is known for its reef systems and channels linking small islands, reached by boat from the villages on Maratua. Divers have also reported Anna's Chromodoris and Coi's Goniobranchus nudibranchs here, along with Graeffe's sea cucumbers and the Puntang goby, making it a site worth a slow look for smaller reef life alongside the coral structure itself.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Puntang GobyExyrias puntangReported here · unconfirmed
Anna's ChromodorisChromodoris annaeReported here · unconfirmed
Graeffe's Sea CucumberPearsonothuria graeffeiReported here · unconfirmed
Coi's GoniobranchusGoniobranchus coiReported here · unconfirmed
Boring Giant ClamTridacna croceaObserved near here · iNaturalist
Green Sea TurtleChelonia mydasObserved near here · iNaturalist
Ocellaris AnemonefishAmphiprion ocellarisObserved near here · iNaturalist
Midnight SnapperMacolor macularisObserved near here · iNaturalist
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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