Environmental challenges of countless number of tourists in coastal regions

Modern tourism is much considered as a profitable industry; also this industry can be harmful for environment. If the number of tourists travel to this area is not controlled, their attendance will bring many side effects for the host region. In Iran, at weekends many tourists travel to coastal regions. This uncontrollable population not only never enjoy their travel but also they cause different problems like soil abortion , changes in coastal line, the devastation of coastal habitats, under ground water pollution or dryness and endangering people's health (due to insufficient networks of sewage and taking away trash ).