Establised in 1990, according to the order of Mr. Chaun Leekpai, Prime Minister and Wild Animal and Plant Foundation of Thailand. It includes Ko Rok, Ko Mai Ngam Tai, Ko Ta La Beng, Ko Lanta Yai, Ko Ngai, Ko Tu Kon Lima, Ko Rok Nok, Ko Rok Nai, Ko Hin Dang and nearby islands of Ko Klang district, Ko Lanta Noi district and Ko Lanta Yai sub district, Amphoe Ko Lanta, Krabi province. It is the 62th national park of Thailand which covers area of 134 square kilometers or 83,750 rais.

Over all geographical feature is the complexity of mountains and rather deep slope. The plain area would be found only in a beach area in the southern part. Most of area here is more than 35 percent slope, except only the middle part of island where a slope is more than 50 percent. The height of this are is range from 100 meters above sea level to a heigth of 488 meters at the peak of mountain.

Most rainfall is in September which is about 391.4 milimeters and the lowest in January which is about 6.5 milimeters. Number of days of the highest raining is in September which is about 21.6 days and the lowest is in February, about 1.6 days.

In rainy season, the national park will be closed Rok Island, Moung - Deang Rock and Ha Island during 16 May - 31 October every year for visitors safety.

1. Mammal Animals consists of 20 families 30 genuses and 38 species which 2 species had gone from Lanta island. They are wild deers and tigers, and the other species is the sea cow which is the conserved animal. The other two species that being gone are the common barking deer and fishing cat. The rarely finding animal on this island is the the marshall big ear crow bat .
2. Birds on these islands are totally 58 families, 130 genuses and 185 species. Most easy find in this national park are Brahminy Kite, Birdled Tern, Emerald Dove , etc while the most difficult find are Orange-Breasted Trogon, Siberian Thrush, and Little Spiderhunter, etc.
3. Reptiles, mostly are Water Monitor, Reticulated Python and Cobra , etc.
4. Amphibians could be found two species, the first one living in canal is Giant Mountain Frog, Ornate Froglet and the second one living in building and ponds. Others amphibians in forest are Polypedates leucomystax (Gravenhorst)-1829 and Small Toads and the difficult find species is the Dorria frog.
5. Sea and Fresh Water Fishes which could be found in fresh water ponds of the islands, fresh water fishes that you can find here such as Blue danio. While the sea fishes would be found along the coral reef, rock beach and fresh water canals such as Lizard fish and Porcupine fish, etc.
6. Animals in the Coral Reef are Staghorn coral, Fungia fungites, Anemone coral, Starflower coral, etc.