Hot Rocks (Sangeang)
Also known as: Bubble Reef
Best time to dive
January to December; April to November
What you might see
- FrogfishLikely
- Ghost pipefishLikely
- MandarinfishReliably seen
- Mimic octopusLikely
- NudibranchLikely
- Pygmy seahorseLikely
- SeahorseLikely
Sightings are seasonal probabilities, not promises - even in peak season nature does its own thing.
Certification & difficulty
Open Water - advanced conditions (currents/depth); dive within your training.
Snorkelling
Not a snorkel site - Limited - shallow entry allows some snorkeling but main interest is macro/muck at depth
Safety notes
Active volcano - some rocks/vent areas too hot to touch; maintain buoyancy and distance from vents; Sangeang Api has ongoing volcanic unrest (increased activity noted by Global Volcanism Program/VolcanoDiscovery in late 2025) so surface conditions/ash should be checked with operators before trips
Permits & fees
Permits and operators change - confirm before booking.
Location
Nearest hub: Bima/Sape
This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.