Ko Hong (Ko Laopilae) and Ko Hong Lagoon (Thale Nai), Krabi Province

Ko Hong stands out among Krabi’s islands for its extraordinary emerald lagoon, completely enclosed by towering limestone cliffs that create a natural swimming pool accessible only by kayak or small longtail boat. This remarkable geological formation, known locally as Thale Nai (inner sea), offers one of Thailand’s most unique marine experiences where visitors can paddle through a narrow cave opening into a secret world of crystal-clear waters surrounded by ancient karst formations.

The main attraction revolves around exploring the hidden lagoon, where you’ll glide through calm, jade-colored waters while towering walls of limestone draped in tropical vegetation rise dramatically around you. Snorkeling conditions around the outer island are excellent, with vibrant coral reefs hosting colorful parrotfish, angelfish, and occasional reef sharks in the clear Andaman waters. The island’s white sand beaches provide perfect spots for relaxation between water activities, while the sound of gentle waves lapping against the shores mingles with calls from resident kingfishers and sea eagles soaring overhead.

Tranquility defines the Ko Hong experience, particularly within the lagoon where the enclosed space creates an almost cathedral-like atmosphere of serenity. The contrast between the intimate, protected lagoon and the expansive ocean views from the outer beaches offers visitors both peaceful contemplation and adventure. Early morning visits provide the most magical moments when soft light filters through the cliff openings, creating an almost otherworldly ambiance that feels like discovering your own private sanctuary.

December through April offers the best weather conditions with calm seas ideal for kayaking and snorkeling. Most visitors arrive via organized day trips from Ao Nang or Krabi town, typically using longtail boats or speedboats for the 30-minute journey. No accommodation exists on the island, making it strictly a day trip destination. Bring waterproof bags for valuables, reef-safe sunscreen, and comfortable swimwear suitable for kayaking. The unique lagoon experience and excellent snorkeling make this one of Krabi’s most rewarding island adventures.