The Ali Sadr Cave (Persian: غار علی صدر) originally called Ali Saadr or Ali Saard (meaning cold) is the world's largest water cave which attracts millions of visitors every year.[1] It is located in Ali Sadr Kabudarahang County about 100 kilometers north of Hamadan, 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. Tours of the cave are available by pedal boats.