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tisfying the demands of a growing number of tourists;

Safeguarding the natural environment in order to achieve both of the preceding aims.

Sustainable tourism is a tourism that is developed and maintained in a way that remains economically worthwhile for an indefinite timescale and does not undermine the physical and human environment that stands and cultivate it. The format of this tourism must be economically sustainable. If it is not economically sustainable and profitable then a doubtful matter to know whether it is environmentally sustainable. Tourism that is unprofitable and impractical will simply terminate to be present or exist (Harris et al., 2002).

Considering many definitions and concepts of sustainable development Rogers et al., (2001) mentioned that there are three operational criteria of sustainable development. These three operational criteria are related one another. If any destination wants to be sustainable and wants to develop and improve their infrastructure they must have to consider these three factors. Three criteria are:

-Economic objectives should not be maximised without satisfying environmental and social constrain.

-Environmental benefits should not necessarily maximise without satisfying economic and social constraints.

-Social benefits should not be maximised without satisfying economic and environmental constraint.

The goal of environmentally sustainability is a maximum level of desired outcome such as economic profit, quality of life what will maintain in a steady way, subject to constraints imposed by environment. Basis on this concept it can be said that environmentally sustainable tourism implies a key importance on maintaining a certain level of environmental quality. This is highlighting that, a sustainable environment and a viable tourism industry are essential elements to make an environmentally sustainable tourism (Johnston & Tyrrell, 2007).

Moreover the willingness of tourism industry is much more essential for any host country to go for an implementation of the thinking of sustainable tourism. According to Tony Griffin and Terry DeLacey, at least three issues to consider before adopt self-regulatory sustainable tourism practices for any tourism enterprises (Harris et al., 2002) are:

Knowledge of appropriate practices and technologies to adopt in certain context

The perception that some benefits will arise as a result of adopting such practices

To ensure that an appropriate level of environmental performance is maintained.

Given that the most desirable sustainable outcomes differ across groups, the search for sustainable tourism outcomes must combine environmentally sustainable outcomes (which are often many) with socially acceptable compromise solutions that lie somewhere between the goals for each distinct group (Johnston & Tyrrell, 2007).

Sustainability and host community

Sustainable tourism involves social and economic benefits along with the best possible use of environmental resources for the host communities as well as provision of a secure employment and the respect for their cultures and traditions. The key elements of tourism sustainability include meeting the needs of both visitors and host communities for present and for the future. The relationship bet