There are three main reasons to save agricultural lands in and around sprawling major cities as Tunis and Paris: food security, ecological services and landscape amenities. But the significant differences that distinguish these two cities require, in the case of Grand-Tunis, an approach who can benefit from specific parisian experiences while building projects adapted to local conditions. The project presented here is particularly attentive to the economic context and to social expectations of Tunisians. Out of ecological concerns, this project also aims to fight against urban poverty and to improve quality of people's living environment.