Nusa Penida is the largest of three islands (Nusa Penida, Nusa Lembongan and Nusa Ceningan). The water here is fairly cold but often startlingly clear, with gorgeous corals and prolific fish, occasional turtles, reef sharks and in July to November Mola-Mola (the weird and wonderful sunfish). Manta Point: This area of the coastline features dramatic limestone cliffs that descend straight into the ocean. The swell can be stupendous, sometimes making entry impossible by mid-morning. There is a sandy bottom at 12-18m. The water is quite cold because it comes in from the ocean (22-26 degrees). In addition to manta ray, you may also see other pelagics such as tuna and tiger mackerel.This is the area where the pelagics come in to feed. Mantas are 2-4m in width and are harmless plankton-eaters.