Crystal Bay sits on the west coast of Nusa Penida. Its name says it all: on a good day the visibility can exceed 20 or even 30 metres. The bay is framed by limestone cliffs, a small temple island and a white sand beach, and below the surface there is a healthy reef that drops away into deep blue water.
Two dives in one site
Crystal Bay offers two quite different experiences.
- The inner bay is sheltered, shallow and usually calm. It has colourful hard and soft corals, turtles and plenty of reef fish, and it suits newer divers and snorkellers.
- The outer point drops off steeply into deeper water. This is where cold currents bring mola-mola up to be cleaned, and where conditions can change quickly.
Mola-mola season
The mola-mola, or oceanic sunfish, is one of the heaviest bony fish in the world and normally lives in deep water. Between roughly July and October, cold water upwellings around Nusa Penida bring them up to cleaning stations at depths of about 20 to 30 metres. Crystal Bay is one of the best-known of those stations.
Seeing a mola-mola is never certain. When it happens, it is one of the most memorable encounters in diving.
What the conditions are like
- Currents at the outer point can be strong and can include down-currents. Your guide will only dive there when it is safe for the group.
- Temperature can drop sharply during mola season. Water under 20 °C is common at depth.
- Visibility is often excellent, which is how the bay got its name.
Who this dive suits
Open Water divers can enjoy the reef in the bay. To look for mola-mola at the outer point, Advanced Open Water certification and recent diving experience are strongly recommended. The cold water and current call for good air consumption and buoyancy control.
How the day works
Trips leave from Sanur by boat and take about 45 minutes to reach Nusa Penida. A dive day usually combines several sites around the island. The guide chooses the order and the sites based on the tide, current and visibility on the day.
Diving responsibly
Mola-mola are easily stressed. Keep your distance, stay below and behind the fish, avoid blocking its path back to the deep, and never touch it. Respect for the animals is what keeps them coming back each season.
Frequently asked questions
When can I see mola-mola at Crystal Bay?
Mola-mola are most often seen from July to October, when cold water rises from the deep. Sightings are never guaranteed, even in peak season.
Is Crystal Bay suitable for beginners?
The inner bay is calm and shallow and suits beginners and snorkellers. The outer point, where mola-mola are found, can have strong currents and is better for experienced divers.
How cold does the water get?
During mola season the water can drop below 20 °C and sometimes much lower at depth. A 5 mm wetsuit, and a hood for some divers, is recommended.
Is Crystal Bay part of every Nusa Penida trip?
Not always. The guide chooses sites on the day based on current, swell and visibility. Crystal Bay is one of the regular sites, along with Manta Point and others.
