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New migratory forms that lead to the circulation of poor migrants in long rotational movements with no sedentarisation have given birth to circulatory trans-national territories. These territories, which are woven by the routes of networks, present specific outlines and modalities of articulation to the local societies that can be observed in the cities of Eastern as well as Western Europe along the Mediterranean Basin. This article studies these new sociospatial morphologies in the city of Sofia, the Bulgarian capital which is inscribed in a commercial chain articulating Western Europe and the Middle East, and in the city of Alicante, a Spanish portuary city turned towards the Maghreb. The author observes the spatial relations between exarcerbated forms of « gentrification » and the formation of urban spaces of foreigners indebted to the new migratory forms.