Explore a hidden gem of geological beauty within the tranquil expanse of Bai Tu Long Bay at Thien Canh Son Cave. While perhaps not as vast as Sung Sot Cave in core Ha Long Bay, Thien Canh Son offers a captivating and often less crowded cave experience, prized for its natural beauty and serene atmosphere. Located on Cong Do Island, accessing the cave involves a short climb, rewarding visitors with both stunning cave formations and beautiful bay views near its entrance.

Inside Thien Canh Son Cave, you'll discover two main chambers adorned with naturally formed stalactites and stalagmites that have developed over millions of years. The formations often resemble various natural shapes, like lotus flowers, elephants, or seals, sparking the imagination. Careful lighting enhances the textures and shapes within the cave, creating a magical and somewhat intimate atmosphere compared to the larger, more heavily visited grottoes elsewhere in the region.

Visiting Thien Canh Son Cave is a highlight for many cruising through Bai Tu Long Bay, offering a perfect blend of gentle adventure and natural artistry. After exploring the cave's interior, the nearby small, pristine beach below often provides an opportunity for swimming or simply relaxing and admiring the surrounding karst landscape. This beautiful cave perfectly complements the peaceful and pristine nature of a Bai Tu Long Bay journey.