Reef mantas queuing at a cleaning station in 10m of water, hovering while wrasse pick them clean, and swell surging over the…Reef mantas queuing at a cleaning station in 10m of water, hovering while wrasse pick them clean, and swell surging over the rocks so it feels alive. In the cold Jul-Sep upwelling, 2-3m mola mola rise from the deep at Crystal Bay, the strangest fish in the ocean. A limestone cliff coast that funnels cold, nutrient-rich Indian Ocean water up from the Lombok Strait. Local villages now run manta protection and a reef-tax system; Indonesia banned manta ray fishing across its whole EEZ in 2014, creating the world's largest manta sanctuary. Anchorage: Exposed south coast of Penida, day trip from the sheltered north-coast anchorages. Hazards: No site-specific hazards noted, brief normally. Plus