Three Whale Rock
Short answer: Hin Sam Wan ('Three Whale Rock') is a group of sandstone outcrops on a cliff edge in the Phu Sing National Reserved Forest, Bueng Kan province, near the Mekong River and the border with Laos. Seen from above, the three elongated rocks look like a whale family: father, mother and calf.
Tourism sources and Wikipedia call the formation 75 million years old. A geology write-up identifies the rock as quartz-rich sandstone of the Phu Phan Formation, laid down by rivers in the Early Cretaceous, about 125 to 113 million years ago. It suggests the 75-million figure more likely reflects later uplift and exposure. Only two of the 'whales' can be reached on foot, and the 'baby' can't. The Tourism Authority of Thailand singles out early-winter sunrises, especially in November.
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What should you know about Three Whale Rock?
Quick facts. Each one stands alone and has a stable ID you can cite.
Only two of the three 'whales' can be reached on foot.
The rock belongs to the Early Cretaceous Phu Phan Formation, according to a geology write-up.
Video transcript: Three Whale Rock: Whales in a Sea of Forest
DID YOU KNOW? Three Whale Rock is a striking natural rock formation located in Phu Sing Forest Park in northeastern Thailand, near the border with Laos. The site consists of three enormous sandstone boulders aligned along a ridge, resembling a family of whales swimming side by side when viewed from above. Formed through millions of years of erosion and geological uplift, the rocks sit atop a forested mountain, offering panoramic views of misty hills and the Mekong River basin. Visitors can hike up to walk across the broad, smooth surfaces of the rocks, especially popular at sunrise when the landscape is bathed in golden light.
Burned-in captions, read frame by frame (see transcript.md) · 31.8s Reel ·
The write-up
Whales in a sea of forest. Three sandstone boulders in Thailand's Bueng Kan province.
- Exhibit A
Where
Hin Sam Wan is in the Phu Sing National Reserved Forest in Bueng Kan, Thailand's northeasternmost province, near the Mekong and the Lao border.
- Exhibit B
A whale family
From above, the three elongated outcrops look like father, mother and baby whales emerging from a 'sea' of forest. Only the father and mother can be reached on foot.
- Exhibit C
How old?
Tourism sources and Wikipedia say 75 million years. A geology write-up places the sandstone in the Early Cretaceous Phu Phan Formation (about 125-113 million years) and suggests the 75-million figure reflects uplift and exposure.
- Exhibit D
Shaped by weathering
The resistant quartz sandstone was exposed by the gradual uplift of the Khorat Plateau and then rounded by weathering and erosion.
- Exhibit E
The view
On clear early-winter mornings, especially in November, sunrise lights up the forest toward Phu Wua, the Mekong and the mountains of Laos.
Questions people ask about Three Whale Rock
What is Three Whale Rock called in Thai?
Hin Sam Wan means 'three whales rock'.
Source: Write-up · Exhibit A (Where) · Wikipedia: Hin Sam Wan; TAT Newsroom (2018): The Seasons Episode 2, The End of the Cliff
Which province is it in?
Bueng Kan.
Source: Write-up · Exhibit A (Where) · Wikipedia: Hin Sam Wan; TAT Newsroom (2018): The Seasons Episode 2, The End of the Cliff
Which 'whale' can't be reached on foot?
The baby whale.
Source: Write-up · Exhibit B (A whale family) · Wikipedia: Hin Sam Wan; Geology In (2025): Three Whale Rock (Hin Sam Wan)
What rock are the 'whales' made of?
Quartz-rich sandstone.
Source: Write-up · Exhibit C (How old?) · Wikipedia: Hin Sam Wan; Geology In (2025): Three Whale Rock (Hin Sam Wan); Wikipedia: Phu Phan Formation
Which river is visible from the site?
The Mekong.
Source: Write-up · Exhibit E (The view) · TAT Newsroom (2018): The Seasons Episode 2, The End of the Cliff
Test Your Knowledge
All quizzes →5 questions, all from this case file. Answers are revealed instantly.
What is Three Whale Rock called in Thai?
- Hin Sam Wan
- Wat Rong Khun
- Phi Phi
- Doi Suthep
Show the answer
Answer: A. Hin Sam Wan Hin Sam Wan means 'three whales rock'. Source: Write-up · Exhibit A (Where) · Wikipedia: Hin Sam Wan; TAT Newsroom (2018): The Seasons Episode 2, The End of the Cliff
Which province is it in?
- Bueng Kan
- Phuket
- Chiang Mai
- Bangkok
Show the answer
Answer: A. Bueng Kan Bueng Kan. Source: Write-up · Exhibit A (Where) · Wikipedia: Hin Sam Wan; TAT Newsroom (2018): The Seasons Episode 2, The End of the Cliff
Which 'whale' can't be reached on foot?
- The baby
- The father
- The mother
- None of them
Show the answer
Answer: A. The baby The baby whale. Source: Write-up · Exhibit B (A whale family) · Wikipedia: Hin Sam Wan; Geology In (2025): Three Whale Rock (Hin Sam Wan)
What rock are the 'whales' made of?
- Sandstone
- Granite
- Basalt
- Marble
Show the answer
Answer: A. Sandstone Quartz-rich sandstone. Source: Write-up · Exhibit C (How old?) · Wikipedia: Hin Sam Wan; Geology In (2025): Three Whale Rock (Hin Sam Wan); Wikipedia: Phu Phan Formation
Which river is visible from the site?
- The Mekong
- The Chao Phraya
- The Ganges
- The Yangtze
Show the answer
Answer: A. The Mekong The Mekong. Source: Write-up · Exhibit E (The view) · TAT Newsroom (2018): The Seasons Episode 2, The End of the Cliff
Cite this case file
Easterling, Marcus. "Three Whale Rock." The Detail Department (DetailEnjoyer), case file DD-703, last updated Mar 2, 2026. https://detailenjoyer.com/case/three-whale-rock/
Permalink: https://detailenjoyer.com/case/three-whale-rock/ · Last updated
Cite a single fact by its ID, for example DD-703-F01 → https://detailenjoyer.com/case/three-whale-rock/#DD-703-F01
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