This research proposes to identify the factors of the urban landscapes degradation in Hergla’s city (Tunisia) according on the citizen participation. It is based on the survey method which is developed around two axes: the citizen perception of urban landscapes and the factors of their degradation. According to the responses obtained, "the sea" represents the particular value of the landscapes identified as "quality" in Hergla. Citizens don’t appreciate landscapes of urban sprawl which makes the city lose its identity. Moreover, the lack of citizen participation in the urban actions and the non-observance of the urban regulations are the most cited factors of the landscape degradation. These results highlight the importance of involving the citizens in the planning process for a sustainable territory.

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This paper discusses the issue of territorial identity by facing globalization in Hergla's delegation. In order to requalify the “image of the city”, amulticriteria analysis of the landscape units ofthe “El Medfoun” forest and the Sebkha “Halk El Menjel” has been developed to detect symbol indices of change for a new “territorial landscaping”. These natural areas were identified as new iconic objects. Indeed, the Sebkha and the forest, carrying ecological, patrimonial, social and economic values, may be integrated into a territorial project, through of landscape geomediation practices. These values are considered as identity factors for the sustainable development of Hergla delegation.

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