Khao Sok is a remnant of a prehistoric coral reef older than the Amazon
In short: Hidden within Thailand's Surat Thani Province lies a rainforest estimated to be over 160 million years old. This landscape, once part of a massive coral reef stretching from China to Borneo, now features dramatic limestone karsts and a lake created by a dam that transformed the local ecosystem.
The geological history of Khao Sok is defined by ancient tectonic shifts. Approximately 300 million years ago, the region was covered by a shallow sea that fostered a coral reef estimated to be five times larger than Australia's Great Barrier Reef. The subsequent collision of the Indian and Eurasian plates between 0 and 66 million years ago forced these limestone deposits upward, creating the iconic karst formations that rise up to 600 meters above sea level today.
This environment is among Thailand's wettest, receiving 3,500 millimeters of annual rainfall. The moisture supports a remarkably diverse ecosystem, with estimates suggesting the park contains over five percent of the world's species. Among its unique inhabitants is the world's first known amphibious centipede, discovered in 2001, and the Asian arowana, an endangered fish species that finds its last natural Thai habitat in the waters of the Ratchaprapha Dam.
Human history in the area is equally complex. While early migrants arrived during the Ice Age, modern settlement accounts began in the 1800s. In the 1970s, the park served as a refuge for student activists and insurgents who protected the forest from industrial exploitation for seven years. In 1980, the area was officially designated a national park, though this status soon intersected with national infrastructure needs. The completion of the Ratchaprapha Dam in 1982 created the 165-square-kilometer Cheow Lan Lake, which, while providing electricity, resulted in the loss of 52 fish species that could not adapt to the transition from a flowing river to a stagnant reservoir.
Today, the park remains a site of both ecological significance and tourism. Visitors explore the limestone cliffs and caves, though the park's biological reality is often misunderstood. While many sources suggest the presence of tigers, there has been no trail camera evidence to confirm their existence in the area for decades. Instead, the park is better known for its endemic flora, such as the endangered palm Kerriodoxa elegans and the famous Rafflesia kerrii flower.
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Sources
- Summary by Intellect · source: Khao Sok National Park
- Also: Wikidata — Khao Sok · CC0
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