Ali Sadr Cave is one of the most extraordinary natural wonders in Iran and is recognized as the largest water cave in the world. Located in Hamedan Province, in western Iran, this stunning cave features kilometers of navigable waterways that visitors explore by boat, gliding through underground lakes and tunnels.

Its geological formations, colorful stalactites and stalagmites, and cool, silent atmosphere offer a surreal and unforgettable experience beneath the surface of the earth.

Location and Access

Ali Sadr Cave is situated near the village of Ali Sadr, about 75 kilometers north of Hamedan City. The cave lies at an altitude of 2,100 meters above sea level, surrounded by beautiful mountains and natural scenery.

• Access: Reachable by road from Hamedan or Kabudarahang
• Parking and facilities available at the site entrance

Cave Features

• Length: Over 11 kilometers explored, with a significant part accessible by boat
• Height: Ceilings rise up to 40 meters in places
• Water depth: Varies between 1 and 15 meters
• Water clarity: Crystal-clear, allowing visibility of the cave floor
• Temperature: Stable year-round at about 12°C (54°F)

Visitors travel through the cave in paddle boats, guided by expert staff. The route passes through narrow tunnels, wide chambers, and breathtaking rock formations illuminated by soft lighting.

Geological Formations

The cave is estimated to be more than 70 million years old, dating back to the Cretaceous period. Inside, you’ll see:

• Colorful stalactites and stalagmites
• Natural stone curtains and columns
• Echo chambers and stone formations resembling animals or objects

The combination of natural beauty and still water reflections creates a magical underground landscape.

Visiting Information

• Open year-round, with peak season in spring and summer
• Ticket required for boat entry (prices vary for domestic and foreign tourists)
• Life jackets provided and required during the boat tour
• Tour duration: Approximately 1 to 1.5 hours

Nearby Attractions

• Lalejin (city of pottery)
• Ganjnameh Inscriptions and Waterfall
• Hamedan city center, with historical and archaeological sites

Travel Tips

• Wear warm clothing even in summer, due to the cool cave interior
• Photography is allowed but flash may be restricted
• Be prepared for high humidity inside the cave
• Avoid visiting on major holidays to escape crowds

Why Visit Ali Sadr Cave?

Ali Sadr Cave offers a rare opportunity to sail through a natural underground wonder. It combines adventure, geology, and serenity in a way few other destinations do. Whether you are a nature enthusiast, family traveler, or adventure seeker, this cave provides one of Iran’s most unique experiences.