Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Ali Sadr Cave originally called Ali Saad (meaning dam) or Ali Saard (meaning cold) is the world's largest water cave which attracts millions of visitors every year. It is located about 100 kilometers north of Hamedan, western Iran (more accurately at 48°18'E 35°18'N). Since the cave is situated between the large cities Hamadan, Tehran, and Qom it is a popular destination for Iranians. Tours of the cave are available by pedal boats. This cave is located at 48°18'E 35°18'N, in the southern part of Ali Sadr village. The cave is entered at he side of a hill called Sari Ghiyeh which also includes two other caves called Sarab and Soubashi, each 7 and 11 kilometers from Ali Sadr Cave. Apparently, the water in Ali Sadr cave is supplied by a spring in Sarab.