Ko Bi Da Nok, Krabi Province

Crystal-clear waters surrounding Ko Bi Da Nok reveal vibrant coral gardens just meters from shore, making this small island one of Krabi’s premier snorkeling destinations. Part of the Phi Phi archipelago, this uninhabited island offers pristine marine environments without the crowds that pack nearby Phi Phi Don. The island’s compact size means you can explore its entire coastline in a single day while enjoying some of Thailand’s most accessible coral reef snorkeling.

Shallow coral reefs encircle the island, teeming with tropical fish that dart between staghorn and brain corals in water so clear you can see the sandy bottom at 10 meters depth. Schools of yellow snappers, parrotfish, and angelfish create living rainbows against the coral backdrop, while gentle currents make snorkeling comfortable for beginners. The island’s rocky shoreline provides natural pools during low tide, perfect for observing smaller marine life. Above water, limestone cliffs rise dramatically from the sea, their surfaces carved by wind and waves into fascinating formations. Seabirds nest in the cliff crevices, their calls echoing across the water throughout the day.

Tranquility defines the Ko Bi Da Nok experience, with only the gentle lapping of waves and distant bird songs breaking the silence. Tour groups typically spend 45 minutes here, allowing time to snorkel, relax on the rocky shores, and take photos without feeling rushed. The absence of beaches means most visitors stay in the water or on their boats, creating an intimate connection with the marine environment. Floating above the coral gardens feels like drifting through an underwater sculpture park.

Speedboat tours from Ao Nang, Railay, or Krabi Town include Ko Bi Da Nok as part of four-island day trips, typically arriving mid-morning when visibility is best. Bring reef-safe sunscreen, as the shallow waters offer little UV protection, and consider bringing your own snorkeling gear for a better fit. The dry season from November to April provides the calmest seas and clearest water. While you cannot stay overnight, the island’s exceptional coral reefs make it worth the boat trip for anyone interested in marine life.