Ouvrage issu d'un mémoire de DEA effectué sous la direction de J. Le Rider, soutenu à l'Ecole Pratique des Hautes Etudes en 2005 et remanié sous la direction de M.-C. RobicInternational audienceThe frame of this study is the epistemology of geography and it insists on the rela-tions between German geography and French geography In focussing on the French geograph E. de Martonne (1873-1955) and in restricting the study to Central Europe (in insisting on Germany and Rumania), différent ways of research are explored. First, how de Martonne was embodying the boss of French geography at a critical moment in the history of the discipline ? Second, which role has played E. de Martonne as geograph-expert at the “Comité d'études”, who has prepared t...