Ponora is a water cave about 2 km south-south-west of the village of Chiren, Vratsa province, at the western foot of the Milin Kamak ridge in the Western Fore-Balkan. It is not in the Iskar gorge. It formed in limestone and is a permanent sinkhole of the Lilyashka river: the river enters the cave and flows through all its passages.
Ponora is 3,497 m long. The underground river forms small waterfalls and a series of narrow, long and in places deep lakes. The last lake is nearly 800 m long and ends in a sump. Its water comes out at the Zhabokrek karst spring, and the sump itself is accessible only to divers. The cave has many flowstone dams, columns, stalagmites and stalactites. The best-known formations are the Big Waterfall, the Castles and the Atomic Explosion.
It was discovered in 1960, mapped in 1961 and declared a natural landmark in 1963. It is part of the Bozhia Most–Ponora protected area.
The cave is not developed for visitors. Inside you walk and swim in water, so you need a wetsuit, a helmet and a head torch. Going in without an experienced guide and caving skills is not recommended, and it is dangerous in high water. It is not for children.
2.2 km to the north-west is the Bozhia Most rock bridge near the village of Lilyache, an easy sight that suits families too.
Vratsa region
2.2 km away
Vratsa region
4.2 km away
Vratsa region
4.7 km away
Vratsa region
10.9 km away
Ponora is located in Vratsa, Bulgaria.
Ponora is most easily reached by car. Use the coordinates above to navigate, or open the location in OpenStreetMap or your preferred maps app for turn-by-turn directions. Public transport options vary by region — for remote destinations a rental car gives the most flexibility.
Caves can be visited year-round — the temperature inside stays roughly 10–12°C regardless of season. Spring and autumn are quieter than peak summer. Bring a warm layer and sturdy footwear; some caves close in winter when access roads become impassable.
Access to caves varies. Show caves typically run guided tours during posted opening hours; wild caves require proper equipment and experience. Inside, the temperature stays cool year-round (~10–12°C) — bring a warm layer, sturdy non-slip footwear, and a torch even on guided tours.
