Discover the unique natural beauty of the Thang Hen Lake System, a remarkable series of interconnected freshwater lakes nestled amidst limestone karst mountains within the Non Nuoc Cao Bang Geopark. Located about 30 kilometers from Cao Bang city, this picturesque area offers a tranquil escape and showcases fascinating hydrology, as the lakes' water levels fluctuate dramatically with the seasons and are linked by underground caves.

The system comprises around 36 natural lakes (though the number visible varies seasonally), with Thang Hen Lake being the largest and most accessible. Surrounded by lush forests and towering peaks, the lakes boast stunning emerald-green or sapphire-blue water, depending on the time of year and depth. Visitors can enjoy boat trips on Thang Hen Lake, relax by the water's edge, or explore nearby caves like Thang Hen Cave.

Visiting the Thang Hen Lake System provides a peaceful retreat into nature. The serene atmosphere, beautiful scenery, and unique geological features make it a worthwhile destination. Taking a boat tour offers the best way to appreciate the beauty of the main lake and its surrounding karst landscape, providing a different perspective on Cao Bang's diverse natural attractions.