Tien Ca Cave: Discovering one of the most beautiful caves in Ninh Binh

Tien Ca Cave (Mermaid Cave) is situated within the Thung Nham Bird Park Ecotourism Zone complex in Hai Nham Village, Ninh Hai Commune, Hoa Lu District, Ninh Binh Province. The cave was formed over millions of years within the karst limestone mountain system of the Truong Yen – Hoa Lu region. It stretches approximately 500 meters in length, reaching a maximum width of 40 meters and a peak height of 30 meters. Inside, a crystal-clear underground stream-cool year-round-flows alongside naturally shaped stalactites, creating an atmosphere characteristic of the caves in the Hoa Lu area.

The name "Tien Ca" (Mermaid) stems from this distinctive beauty; illuminated by the light within the cave, the underground stream and layers of stalactites evoke the imagery of an underwater world. Yet, there is also an intriguing story behind this poetic name. Locals formerly called the site "Hang Ca" (Fish Cave), as it was once the habitat of two prized fish species: the "Tien Vua" snakehead and the "Tong Truong" climbing perch. These rare fish, which thrived in the cold springs amidst the limestone mountains, were renowned for their delicious meat and were once offered as delicacies to royalty. Visitors exploring Tien Ca Cave do not travel by boat; instead, they traverse the cave's interior via a network of floating bridges, iron walkways, and bamboo paths. This mode of exploration allows visitors to leisurely observe the rock faces, watch the stream flowing beneath their feet, and more keenly sense the shifting atmosphere as they venture deeper into the cave.

In particular, from around the tenth lunar month to the second lunar month of the following year, the water inside the cave becomes crystal clear, offering ideal conditions for visitors to easily observe schools of fish swimming in the turquoise depths. It is this combination of pristine beauty and legendary allure that makes Mermaid Cave a captivating destination for those who love exploring the nature and local culture of Ninh Binh.

Upon entering Mermaid Cave, visitors are immediately greeted by the cool air rising from the mountain's depths and the gentle sound of underground water flowing beneath the bridges that span the cavern. The rock walls display a variety of natural formations-ranging from coral reefs and diamond-like cascades to shapes resembling dolphins, elephant heads, and crocodiles-including a rock formation that evokes the image of a sleeping mermaid, offering a poetic explanation for the cave's name.

Illuminated by artificial light, the stalactites cast their reflections onto the crystal-clear water, creating shifting patterns of light and shadow that change with every step. Notably, an opening in the cave ceiling admits natural light, greenery, and views of the cliff face, allowing the exploration journey to transition from the cool, rocky interior to an open, airy landscape in just a few paces.

To reach Mermaid Cave, you can start your journey from Hanoi or neighboring provinces. It is located approximately 100 km south of Hanoi a 2-3 hour drive by car or motorbike via the Hanoi–Ninh Binh Expressway. If traveling from Ninh Binh city center, the site is just 12–15 km to the southeast; take National Highway 1A and then turn onto the provincial road leading to Thung Nham.

Public transport: Take a standard or sleeper bus from Giap Bat Bus Station (Hanoi) to Ninh Binh (tickets cost around 70,000–90,000 VND per person). Upon arrival, you can rent a motorbike in Ninh Binh (approx. 100,000 VND/day) to travel to Thung Nham.

Private vehicle: Traveling by car or motorbike is the most convenient option, as the route is straightforward and well-signposted.

After arriving at the Thung Nham tourist area, purchase an entrance ticket and walk to the entrance of Mermaid Cave. The path involves climbing about 200 stone steps shaded by green bamboo, followed by a descent of roughly 40 rather steep iron steps to enter the cave itself. The tourist area features a spacious parking lot that accommodates both motorbikes and cars.

If time permits, you can also explore the Thung Nham Bird Park and other attractions within the complex to make the most of your trip.

Exploring Mermaid Cave (Động Tiên Cá) is more than just entering a cavern; it is a journey that takes you through underground streams and past stalactites amidst ever-changing spaces. Each section of the cave offers a unique experience, from spotting fish in the crystal-clear water to discovering fascinating shapes formed on the rock walls.

• Walking across the floating bridge: Instead of taking a boat, visitors walk directly across a system of floating bridges, allowing them to pause at will to admire the stalactites, observe the clear water beneath their feet, and take photos.

• Viewing fish species steeped in legend: From the 10th lunar month to the 2nd lunar month of the following year, when the water is clearest, visitors have the chance to see "King's Tribute" snakehead fish and "Tong Truong" climbing perch swimming within the cave.

• Discovering fascinating stalactite shapes: Over millions of years, stalactites have formed various natural shapes—including formations resembling a mermaid-which inspired the cave's distinctive name.

• Combining the visit with Thung Nham: After exploring Mermaid Cave, visitors can continue to But Cave (Hang Bụt), Vai Gioi Cave (Động Vái Giời), and the Thung Nham Bird Park. Late afternoon is a particularly beautiful time to watch flocks of birds returning to their roosts.

• Embracing the spirit of exploration: Some sections of the cave are low and narrow, requiring visitors to stoop or move carefully. These very stretches add an exciting element to the adventure of exploring Mermaid Cave.

The ideal time to explore Tien Ca Cave is during the dry season, which lasts from March to May and October to December, when the weather is cool and mildly sunny—perfect for trekking and cave sightseeing. Conversely, during the rainy season (June to September), water levels in the underground stream can rise, limiting mobility and overall experience.

In particular, from around October to February of the lunar calendar, visitors also have the chance to admire large schools of fish swimming beneath the crystal-clear stream, adding vibrant charm to the journey. For a more comfortable trip, try to avoid major holidays and prioritize early morning visits when the air is fresh and crowds are light.

To make your exploration of Tien Ca Cave smoother and safer, visitors should prepare carefully before visiting. Below are important notes to ensure a complete experience while contributing to preserving the cave's pristine beauty.

• Physical preparation: The path up and down involves many steep steps requiring a degree of stamina. Wear sports shoes with good grip for safe movement.
• Suitable attire: Opt for comfortable, breathable clothing. The interior of the cave is usually cooler, so bringing a light jacket is recommended.
• Safety assurance: Follow the tour leader's instructions, do not separate from your group, or explore areas outside permitted zones. Carry drinking water and a backup flashlight when necessary.
• Environmental protection: Do not litter and do not touch the stalactite formations to preserve the cave's natural structure.
• Combined experiences: Visitors can visit Thung Nham to observe seasonal migratory birds and savor local specialties such as Ninh Binh mountain goat meat and crispy rice.

Tien Ca Cave is not only a testament to the magnificent geological beauty of Ninh Binh but also a highly rewarding stop for nature lovers. From vivid stalactites and enchanting reflected light to rare pristine spaces, this destination offers visitors the sensation of entering a fairy-tale world in the heart of limestone mountains. Thus, the journey to explore Tien Ca Cave goes beyond admiring scenery—it is an opportunity to gain deeper insight into the geological and ecological values that Ninh Binh preserves.