The Ali Sadr Cave (Persian: غار علی صدر) is the world’s largest water cave which attracts thousands of visitors every year. It is located about 100 kilometers north of Hamadan City, western Iran (more accurately at 48°18’E 35°18’N). Because of the cave’s proximity to large cities such as Hamadan, it is a highly recommended destination for tourists from all corners of the world.
The cave is entered at the side of a hill called Sari Ghiyeh which also includes two other caves called Saraband Soubashi, every 7 and 11 kilometers from Ali Sadr Cave. Apparently, the water in Ali Sadr cave stems from a spring in Sarab.
In the summer of 2001, it was found through an expedition that the cave is 11 kilometers long. The main chamber of the cave is 100 meters by 50 meters and 40 meters high.
The cave walls can extend up to 40 meters high, and it contains several large, deep lakes. The cave has a river flowing through it and most travel through the cave system is done by boat. More than 11 kilometers of the cave’s water canals have been discovered so far. Some routes are 10 to 11 kilometers long and all lead to “The Island”, a centrally located large atrium.
Excavations and archeological studies of the cave have led to the discovery of ancient artworks, jugs, and pitchers dating back to 12,000 years ago. Animals, hunting scenes, and bows and arrows are depicted on the walls and passages of the exit section. These images suggest primitive man used the cave as their abode. The cave was known during the reign of Darius I (521-485 BC) which can be verified by an old inscription at the entrance of the tunnel. However, the knowledge of the existence of the 70-million-year-old cave was lost, and it was only rediscovered in 1963 by Iranian mountaineers.
Reference: https://en.wikipedia.org/wiki/Ali-Sadr_Cave
