
Nestled within a Triassic limestone range formed around 250 million years ago inside Tuong Mountain, Thien Ha Cave in Ninh Binh possesses an otherworldly beauty. When lights illuminate the cavern ceiling, tens of thousands of glittering stalactites are reflected in the underground water, creating the sensation of drifting through the Milky Way beneath countless shining stars.
The cave stretches for about 700 meters, comprising a 200-meter dry section and a 500-meter water-filled section. Often described as a "fairyland," it is considered one of Ninh Binh's most beautiful caves and is also known as the "Milky Way inside the mountain."
A representative of the Thien Ha Cave tourism site said the cave was discovered in 2002. At the time, its entrance was merely a narrow crevice, just wide enough for one person to squeeze through. Inside, mud, soil, sand and rocks filled the cave almost to the ceiling.
After 10 years of painstaking manual excavation, local residents finally removed the accumulated material, revealing the cave as visitors see it today.
To reach Thien Ha Cave, visitors take a roughly 15-minute boat ride from a pier on the Ben Dang River to the Tuong Mountain area. From there, they walk about one kilometer to the entrance of the dry cave, which is around three meters wide and five meters high.
Inside, the ceiling and floor are relatively level, with numerous striking stalactite and stalagmite formations in unusual shapes.
At the end of the dry section, visitors emerge into an open space with a natural skylight piercing the limestone mountain. Locals call it the "sky gate."
Looking upward, visitors can see blue sky and drifting white clouds. On sunny days, beams of sunlight stream through the opening into the cave, producing a spectacular halo of light.
Beyond the "sky gate" lies the water-filled cave, where visitors board boats and travel along a clear underground river about one meter deep, which locals liken to the Milky Way.
The river winds among countless shimmering rock formations, some of which have been given names such as Hoa Tien Island, Mother's Breast and Transforming Dragon Fish.
According to assessments by American experts, the stalactite system inside Thien Ha Cave remains "alive" and continues to develop, distinguishing it from formations in many other caves across Ninh Binh Province.
In 2008, archaeologists discovered shells from mountain snails and clams, along with charcoal and ash, inside the cave for the first time. These were traces of daily life left behind by ancient Vietnamese inhabitants.
The landscape surrounding Thien Ha Cave has been likened to a "dragon holding a pearl in its mouth." Mountain walls encircle the site, while the winding Ben Dang River flows below, shaping a picturesque landscape of mountains and water.













