(1/8/2017) Koh Rok in The Lanta Marine National Park. Koh Lanta. Krabi. Thailand. Snorkelling: available all year, subject to weather and sea conditions. The Lanta Marine National Park features a number of small protected islands where a vast coral reef with brightly coloured fish and sea life can be seen. (Photo by Sergi Reboredo) *** Please Use Credit from Credit Field ***