This particular site can be split, as you can choose to follow either of the bay's shorelines. The rocky formations visible above the surface continue underwater, with a good presence of reef-fish. Around the rocks swim surgeonfish and fusiliers, while below you can see inquisitive paired goatfish, nudibranchs, urchins and plenty of Blue-spotted Ribbontail Rays. Coral growth is on average better here than along the east coast. There is no mooring buoy.
Currents vary from weak to moderate.
Racha Yai's eastern side consists of sloping hard coral reefs, mainly foliaceous corals. Many featherstars, lionfish, puffers and a few parrotfish and wrasse are present. The site's southern end has the bonus of octopus and a greater display of reef creatures, including good-sized Titan Triggerfish and moray eels, plus a better selection of colorful fish and invertebrates. Leopard Sharks are sometimes seen. The uninhabited island of Koh Racha Noi is 33km due south of Phuket.