345 Million Years Ago
Khao Sok was once part of a vast delta system, much like today’s Mississippi Delta. Over time, erosion caused mudstone and soil to flow into the waters, gradually filling the delta. This process created shallow seas, providing the perfect environment for coral reefs and marine life to thrive.
280–55 Million Years Ago
Continued sediment deposits transformed the landscape, forming the massive limestone formations that define Khao Sok today. Fossils from this period reveal that the region was part of a colossal coral reef stretching from China to Borneo—five times larger than Australia’s Great Barrier Reef. Geological processes also led to the formation of tin and tungsten deposits, as granite mixed with limestone and other minerals.
66 Million Years Ago
The dramatic landscapes of Khao Sok took shape when the Indian landmass collided with the Eurasian plate, pushing up the limestone formations—an event that also led to the rise of the Himalayas. Unlike many regions affected by the Ice Age, Khao Sok remained largely untouched. With no glaciers reaching this far south, its ancient rainforest continued to flourish. When the Ice Age ended, melting waters enriched the ecosystem, making Khao Sok’s rainforest one of the oldest and most biodiverse in the world—older than even the Amazon and Central American rainforests.
50,000 – 37,000 Years Ago
During this period, Khao Sok’s mountains were part of the same geological ridge as Borneo. Archaeological evidence suggests human habitation in Borneo at this time, leading researchers to believe that early humans also lived in Khao Sok. With its abundance of caves, fruits, plants, and wildlife, the landscape would have provided an ideal environment for survival, much like Borneo’s ancient forests.
1800s
The first recorded human settlement in Khao Sok dates back to the early 19th century, during the reign of King Rama II. Amid conflicts between Burma and Thailand, a group of survivors from the western coast fled into the dense jungle, seeking refuge.
As they adapted to their new home, they discovered the forest’s rich natural resources. They practiced agriculture, fishing, and hunting to sustain themselves. Over time, as the population grew, portions of the forest were cleared to make space for settlements and farmland.
1944
A devastating epidemic struck the local community, wiping out most of the inhabitants. The few survivors abandoned the area, and their former village became known as “Ban Sop” – The Village of the Dead. With human activity ceasing, the jungle was left undisturbed for a time, allowing nature to reclaim the land.
1961
A major road was constructed across the region to connect Surat Thani on the east coast with Phang Nga on the west coast. As a result, many settlers moved into the area, clearing vast portions of the forest to build homes and plantations.
Recognizing the area’s rich tin and timber resources, the government began selling land for mining and logging operations. This led to significant deforestation and loss of biodiversity.
1971
During geological surveys, researchers discovered that remnants of the ancient delta system remained remarkably intact. This sparked interest in utilizing Khao Sok as a potential hydroelectric power source for southern Thailand.
As investigations continued, conservationists began to recognize the area’s immense ecological value—its dense rainforest, diverse wildlife, towering limestone mountains, and spectacular waterfalls. Although a decision was made to halt logging and mining, it took many years before conservation efforts were fully enforced.
1976 – 1980
A group of communist students, unable to implement their desired political changes, were forced into hiding deep within the jungle to escape government forces. These conflicts led to a decline in human activity in the region, allowing the rainforest to regenerate undisturbed.
1980
On December 22, Khao Sok was officially designated as Thailand’s 22nd national park, covering an area of 645 km². Later that year, the park’s boundaries were adjusted to accommodate the construction of the Ratchaprapha Dam, a hydroelectric project that continues to provide electricity to much of southern Thailand.
Before the dam’s reservoir was flooded, a massive wildlife rescue operation took place. Over 1,300 birds, mammals, and reptiles were captured and relocated. Unfortunately, despite good intentions, many of the relocated animals did not survive, making the event a tragic chapter in Khao Sok’s history.
2001
Recognizing the park’s ecological importance, its boundaries were expanded from 645 km² to 739 km², further protecting this unique and ancient rainforest.
Southern Thailand and the Malay Peninsula have long been a crossroads of human migration, making them one of the most complex archaeological regions in the world. Excavations in various sites have uncovered multiple layers of human occupation, spanning different historical periods and cultures.
Evidence of prehistoric cave paintings and burial sites raises intriguing questions about the ancient inhabitants of the region. While it remains uncertain whether humans lived in what is now Khao Sok National Park during prehistoric times, the area’s dense forests, abundant wildlife, and numerous caves suggest it could have supported early human life. Some scholars believe that Stone Age people may have thrived in these rugged lands until relatively recently.
Khao Sok was likely home to nomadic forest-dwelling tribes, similar to the Mani people, who are among the last hunter-gatherer communities still surviving in Thailand’s Trang mountains and near the Malaysian border. The existence of a land bridge between Borneo and Khao Sok during the last Ice Age strengthens the theory that prehistoric humans once inhabited this rainforest, much like the ancient populations discovered in Borneo’s Niah Caves, where remains date back 37,000 – 50,000 years.
The first recorded human settlements in Khao Sok date back to the late 18th century, during the reign of King Rama II. When Burmese forces attacked the coastal towns of Takuapa, Takua Thung, and Thalang (Phuket), groups of survivors fled inland, seeking refuge deep within the forests. Some eventually settled in Khao Sok, where they adapted to the environment by hunting, fishing, and foraging for wild fruits and vegetables. Over time, they began clearing land for rice and crop cultivation, taking advantage of the region’s fertile soil and ample rainfall.
Word soon spread about Khao Sok’s natural wealth—rivers filled with fish, forests teeming with wild deer, cattle, and boar—and more settlers arrived, establishing a lasting human presence in this pristine rainforest.
Cheow Lan Lake, also known as Ratchaprapha Dam, is one of the most stunning attractions in Khao Sok National Park. This man-made reservoir was formed in 1987 following the construction of the Ratchaprapha Dam, which was built to generate hydroelectric power for southern Thailand. Spanning approximately 185 square kilometers with a maximum depth of around 94 meters, the lake has since become a haven for both wildlife and eco-tourism.
Often called the “Guilin of Thailand,” Cheow Lan Lake is famous for its towering limestone karsts and lush, jungle-covered islands that rise dramatically from the emerald-green waters, creating a landscape that feels almost otherworldly.
Originally known as Cheow Lan Dam, Ratchaprapha Dam was built by the Electricity Generating Authority of Thailand (EGAT) to support hydroelectric power generation. Construction began in 1982 and was completed in 1987. The dam stands 94 meters high and spans approximately 761 meters in length.
Beyond its role in power production, Ratchaprapha Dam also contributes significantly to irrigation, fisheries, and tourism, transforming the region into a thriving ecological and recreational destination within Khao Sok National Park.
In 1978, after a Cabinet resolution on dam and reservoir construction policies, followed by another resolution in 1981, the Thai government granted approval for the Electricity Generating Authority of Thailand (EGAT) to develop the Cheow Lan Dam hydropower project. EGAT was tasked with collaborating with relevant government agencies to assess and minimize environmental impacts, especially those affecting local wildlife.
Nearly four decades have passed since the wildlife rescue boat, once led by Seub Nakhasathien and his team, was last used. Though it remains preserved at the Khlong Saeng Wildlife Sanctuary, its structure has significantly deteriorated over time. Mr. Pornthawat Chalermwong, head of the sanctuary, has decided to restore the boat and relocate it to the entrance of the sanctuary’s office. Additionally, a dedicated building will be constructed to house the boat, accompanied by an exhibition detailing the wildlife rescue mission, allowing nature enthusiasts to learn about this remarkable effort.
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