With its adjacent deep water trenches, the main attraction at Lembongan Island is the common encounters with the curious and otherwise very rare oceanic sunfish, or mola mola. Sunfish are pelagic fish growing two metres long. They are found in tropical and temperate waters, feeding off large plankton and jellyfish. They have large, blunt heads, heavy bodies and stubbed tails, with elongated dorsal and ventral fins that can span four metres. You will never misidentify a sunfish! They can often be seen at cleaning stations with attendant cleaner wrasse. They are most often seen in this area from July to September.

Crystal Bay is perhaps Nusa Penida's best dive site. It is located in the south west of the island and features a shallow bay, carpeted in corals. The bay provides shelter from current and is a good place to start your dive. Apart from the superb corals in the bay, the big attraction here is that this area is a favourite spot for mola mola, which gather to be cleaned on the slopes of the reef just outside of the bay.