Manta Rays at Koh Bon

Koh Bon's seamount delivers the densest manta ray aggregation in the Andaman Sea, with up to 30 individual rays circling a cleaning station during peak season from February to May. These gentle giants, with wingspans averaging 5.5 meters, are 25% larger than the typical manta found at shallower Thai reefs. The encounter outperforms #7 itself by offering consistent sightings—87% of dives in April record at least one manta. Reef mantas here weigh up to 1,400 kilograms and feed on plankton filtered through cavernous mouths that measure half a meter wide, a visceral experience that rivals the famed Maldives cleanup stations.