A Mysterious Underground Pool of Sri Lanka

Hidden beneath the lush greenery of Sri Lanka’s cultural heartland lies Nil Diya Pokuna, a subterranean wonder that continues to intrigue explorers and history lovers alike. Translated as “Blue Water Pond,” this underground pool near Ella—close to ancient sites like Dowa Rock Temple—offers a stunning blend of natural beauty and historical mystery.

The Hidden Pool in the Depths

Deep within a network of caves, Nil Diya Pokuna remains invisible from the outside world. Reaching it involves navigating narrow, dimly lit tunnels that wind far below the surface. Eventually, you’re greeted by still, crystal-clear blue water that seems to glow from within.

Although many believe the pool connects to a larger underground water system, its full reach remains a mystery. When illuminated, the vivid blue glow creates an atmosphere that feels almost otherworldly.

Historical Significance

According to legend, King Ravana—a central figure in the Ramayana—constructed this cave system as a secret refuge or part of a hidden waterway. Alternatively, some historians link Nil Diya Pokuna to King Kashyapa (477–495 CE), the visionary behind Sigiriya. In either case, the pool may have served as part of a covert escape route during times of war.

While these theories remain unproven, they highlight the sophistication of ancient Sri Lankan engineering and the enduring power of myth in the island’s history.

The Journey to Nil Diya Pokuna

To begin your adventure, you must first trek through dense forest paths. Then, through a small, unassuming entrance, you descend into the cave. Despite its modest appearance, the entrance hides an expansive underground world.

Once inside, the experience becomes both physical and psychological. Explorers must climb, crawl, and sometimes rely on ropes. The air turns cooler, the passage narrows, and every step echoes with suspense. Along the way, sounds of dripping water and distant movement amplify the mystery.

Exploring the Pool

After navigating the tunnels, the underground pool appears—calm, clear, and glowing blue. Its surreal beauty creates a dreamlike setting. So far, no one has determined its depth, which only adds to the mystery.

Though the water is inviting, swimming is discouraged to help preserve its untouched state. Instead, visitors are encouraged to observe in silence, appreciating the pool’s stillness and purity.

Conservation and Challenges

Despite its wonder, Nil Diya Pokuna faces real threats. The lack of infrastructure and official oversight makes conservation difficult. As more travelers find it, sustainable tourism becomes essential.

To help protect the site, visitors should rely on experienced local guides who understand the cave’s terrain and stories. Above all, respecting the natural environment is key to keeping Nil Diya Pokuna intact for future generations.

Tips for Visitors

• Hire a Guide: The caves are complex and potentially dangerous without local expertise.

• Wear Proper Gear: Bring sturdy shoes, flexible clothing, and a strong flashlight.

• Be Physically Prepared: The trek involves crawling, climbing, and stamina.

• Respect Nature: Leave no trace—take only memories.

• Visit During the Dry Season: Rain can make the cave slippery and hazardous.

Conclusion

Nil Diya Pokuna is more than a hidden pond. In truth, it serves as a bridge between Sri Lanka’s mythological past and its natural wonders. For those willing to go deep, it offers a rare combination of adventure, reflection, and historical intrigue.

As you stand in the cool darkness, staring into the motionless blue water, you may feel something profound—a quiet connection to a forgotten world that has waited in silence for centuries.