One of the most popular sites in Qeshm Island in south of Iran is Salt Cave, Namakdan3. This is the longest salt cave in the world. Also Daneshjou (Student Cave) is the fifth cave of the biggest one. A large region of Qeshm Island is announced as Geological Park or Geo Park by UNESCO organization. The cave depth is approximately 1000 m and its average width is about 5m which become deeper and wider because of water penetration, rain, dissolution, and crystallization of salt time to time. You can see a bit salt stalactites and crystal at the corner and bottom of the cave due to lack of tourists `attention to protect them. Unfortunately, they break them and bear with themselves and destroy this most beautiful sights of geology area which creates around long years.