Nusa Penida · Indonesia · Reef · Wall

Crystal Bay

The mola mola site, in cold and sometimes downward current

Crystal Bay sits on the western side of Nusa Penida and is the place divers come to look for mola mola, the oceanic sunfish, in the August to October season. It is cold, moving water reserved for experienced divers: the current can run strong and tricky, it sometimes runs downward, and the site cannot always be dived at all.

Where it is and how deep

Depths on a shared scale to 40 m (130 ft); dashed lines mark common certification limits.

8.7155° S, 115.4575° EPublished position for this site.

The dive

Whether the dive happens at all is settled on the day. The current at Crystal Bay can be strong and tricky and it is not always possible to dive here, so the boat crew makes the call rather than your booking. When it is on, the coral is at its best around 15 to 20 metres and that is where most of the dive is spent. Water around these islands runs 16 to 22°C and is coldest from June to October, so a 5 mm full wetsuit is the standard recommendation rather than a shorty.

Finding a mola mola means going deeper, to around 30 metres, during the August to October season when the sunfish come up from depth to be cleaned of their parasites. Plan that leg carefully: it is a short, deep, cold part of the dive, so watch your gas and your no-stop time. The specific warning at this site is downward current, so keep clear of the drop and stay off the coral instead of taking a handhold when the water pushes.

Marine life and season

Mola mola

Month-by-month season rating for Crystal Bay
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Good	Good	Good	Good	Good	Good	Prime	Prime	Prime	Prime	Good	Good

Season follows Nusa Penida: Mola mola are most likely from July to October, inside the coldest months; mantas stay all year and are likeliest from March to June.

Know before you go

Downward current is the specific warning here. Watch your depth and buoyancy near the drop, and be ready to swim away from the reef rather than ride the water down.
The current can be strong and tricky and the site is not always diveable. Take the crew's decision on the day rather than pressing for Crystal Bay.
The mola mola are found around 30 metres while the coral sits at 15 to 20 metres, so the deep leg is short and cold. Plan gas and no-stop time for it before you drop.
Water runs 16 to 22°C and is coldest from June to October, which is exactly the mola mola window. A 5 mm full wetsuit is the local recommendation.

Photos from Crystal Bay

Tilonaut · CC BY 3.0
Tilonaut · CC BY 3.0
Panina Manina · CC BY-SA 4.0

Dive videos

Crystal Bay, Nusa Penida (Bali) Indonesia (HD) · WesternRoo on YouTube

Questions divers ask

When is the best time to see mola mola at Crystal Bay?+

August to October, when the sunfish come up from deep water to be cleaned. That window overlaps the coldest months of the year here — the water runs 16 to 22°C and is coldest from June to October — so bring more exposure protection than you would use elsewhere in Bali.

Is Crystal Bay always diveable?+

No. The current can be strong and tricky and it is not always possible to dive the site, so boats decide on the day. It is also reserved for experienced divers because the current here sometimes runs downward.

How deep is the dive at Crystal Bay?+

The coral is at its best around 15 to 20 metres, but a chance at a mola mola means going down to around 30 metres. That deep leg is what puts the site beyond an easy recreational profile.