Discover the Enchanting Mountain Angel Eye (Phja Piot) in Trung Khanh, Cao Bang
Nestled in Quoc Toan commune, Trung Khanh district, the breathtaking Mountain Angel Eye (locally known as Phja Piot in Tay language, meaning “mountain with a through-going hole”) is a natural wonder that captivates visitors with its unique geological formation and serene surroundings.
The Unique Beauty of Mountain Angel Eye
Mountain Angel Eye is essentially a circular cave with a diameter of approximately 50 meters, suspended about 50 meters above a pristine lake. This stunning formation is a result of tectonic uplift movements that have shaped the landscape over time, making it one of the most fascinating natural landmarks in Cao Bang.

A Tower Karst Wonderland
The cave is part of a remarkable tower karst landscape at an altitude of 650-700m above sea level (asl). This picturesque setting is dotted with towering limestone formations and numerous lakes, forming the famous Thang Hen Lake System. A unique feature of this system is the interconnected lakes, which experience seasonal water level fluctuations due to both surface and underground water flows.
Nam Tra Lake – A Seasonal Surprise
As visitors journey toward Mountain Angel Eye, they will come across the Nam Tra Lake, a 15-hectare body of water that appears during the rainy season (June-August). However, in the dry season (from September onward), the lake transforms into a doline, where local farmers graze their cattle on lush pastures.
The Hidden Gem: Nam Tra Waterfall
Just a 10-minute walk (500-600m) from Nam Tra Lake, travelers can marvel at the Nam Tra Waterfall, a scenic cascade that adds to the area’s natural charm. This hidden gem is perfect for photography, relaxation, and enjoying the soothing sounds of nature.
Immerse in Tay Culture at Ban Danh Hamlet
Beyond the geological wonders, the journey to Mountain Angel Eye offers visitors a chance to experience the authentic Tay ethnic culture in Ban Danh Hamlet. Here, travelers can witness the harmony between local traditions and nature, with:
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Traditional stilt houses with yin-yang tiled roofs
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Stone fences and vibrant rice and maize fields
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Water buffaloes and cows roaming the pastoral landscapes
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Friendly locals who warmly welcome visitors into their community
This peaceful setting, surrounded by lush greenery and towering karst formations, provides a perfect escape from the hustle and bustle of daily life.

Why Visit Mountain Angel Eye?
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Unique natural formation: A spectacular circular cave above a lake
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Seasonal landscape transformation: Witness the Nam Tra Lake turn into a grazing field
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Breathtaking scenery: Towering karsts, serene lakes, and lush greenery
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Rich cultural experience: Engage with the Tay ethnic community and their traditional way of life
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Easy accessibility: Just a short 15-minute trek from the starting point
Plan Your Visit
For travelers seeking an off-the-beaten-path adventure in Vietnam, Mountain Angel Eye in Trung Khanh, Cao Bang is a must-visit destination. Whether you’re an adventurer, a photographer, or a cultural enthusiast, this hidden gem offers an unforgettable experience.
Explore the wonders of Cao Bang today! Book your adventure now on CaobangAdventures.com or VNNomad.com to discover this breathtaking destination.