Banana Bay, Racha Noi: East Coast Coral Gardens & Sandy Slopes

Banana Bay forms a sheltered cove on the east side of Racha Noi, offering a long, gently sloping dive profile. The initial descent takes you over extensive hard coral gardens, including regenerating staghorn coral (Acropora cervicornis), before the reef transitions into a white sand bottom. This gradual sandy slope continues from around 5 metres down to beyond 30 metres, providing a clear path for exploring deeper sections while maintaining good light penetration even at extended depths.

The topography of Banana Bay is varied, moving from soft sand areas to scattered rock formations and larger reef outcroppings, particularly in its northern part, known as Banana Rock. This area introduces more complex terrain, with massive rocks extending down to 50 metres. This deeper section of the bay provides a different diving experience, allowing for exploration beyond typical recreational limits, suitable for specific deep and technical diving certifications.

As you move through the bay, pay attention to the transition zones where rock meets sand; these are often focal points for activity. The bay’s sheltered nature generally results in mild current conditions, making it an accessible site for divers still building confidence. Visibility here can range from 12 to 25 metres, offering clear views of the resident fish populations and the broader underwater landscape.

Life in Banana Bay is concentrated around the coral and rocky outcroppings. You will encounter redtooth triggerfish (Odonus niger), pufferfish (Tetraodontidae), damselfish (Pomacentridae), and porcupine fish (Diodontidae) moving through the reef structure. Butterflyfish (Chaetodontidae), fusiliers (Caesionidae), and groupers (Epinephelinae) are also visible, often in schools, moving between the coral heads and the open water.

One of the distinct features of Banana Bay is the presence of large schools of glassfish (Ambassidae), particularly around the scattered rocks and corals. When the sun hits these aggregations, they create a shimmering effect, turning the water into a dynamic, living spectacle. Lizardfish (Synodontidae) and ghost pipefish (Solenostomidae) are also present, often camouflaged against the substrate, requiring a keen eye to spot.

Deeper along the sandy slope, especially in the central and southern parts of the bay, you might encounter green turtles (Chelonia mydas) moving along the bottom or resting, an opportunity for quiet observation. Shoals of horse-eye barracuda (Caranx sexfasciatus) are also known to frequent the bay, sometimes forming dense schools that can momentarily obscure your view, creating a memorable encounter before they sweep past.