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In 2017, a group of social scientists started the program SavNat-Afrique. It aims at studying the ecological knowledges within a transnational project of migrant bird’s management between Europe and the Sahel region in Africa. Anchored in different countries, the research was built from the outset on the idea of a multi-sited ethnography. Halfway in this investigation, I discuss some methodological aspects concerning the spatial dimension of the fieldwork: the place of scalar effects, the localization of the ethnographic material, the definition of geographic criteria and the analysis of situations. I focus on the role of interpreters and mediators in giving consistency to these transnational projects. They are related to the strategies developed by beginners or marginal actors to give coherence to their personal action in a world spatially dispersed and socially discontinuous.