About 50 minutes southwest of Chalok Bay, Southwest Pinnacle is another of Koh Tao’s big-fish sites.

The boulders are covered in anemones and surrounded by huge schools of fusiliers, trevally, barracuda, and batfish. You’ll often see the action kick off here as predators chase through the shoals.

It has a real open-ocean feel, and on the best days, whale sharks pass right through the middle of the site.