This study proposes to identify, characterize and compare the recent changes in land using upon two urban wetlands: hortillonnages of Amiens (France) and chinampas of Xochimilco (Mexico). Established along the Middle Ages for agriculture, these areas were subjected to major changes in their functions and in their uses during the second half of the XXth century. Today, they are the support of numerous activities which are sometimes conflicting. However surrounded by fast growing town, they are subjected to urban pressure which can jeopardize space and environment. Over the past decade, both sites, through their unique landscape, also became inherited common properties and tourist places. These recent transformations can be evaluated by diachronic analysis of pictures and also with statistical and onsite datas. These are basics for a proposed guideline in order to answer every question regarding with spatial management keeping in mind that this proposed guideline has to be suitable with each expectation from the stakeholders.
