Abstract : Very few study distinguish planning conflicts from the environmental ones. However the relations between the planning conflicts and space, territory or planning characteristics make them original. It is precisely these relations that this thesis focuses on through a systemic approach. While choosing the study of associations born in reaction with planning projects, this research places the localisation and the mechanisms of the conflicts in the center of the analysis. The methodology is based on an articulation between quantitative and qualitative approaches. A data base built from eight hundred planning conflicts listed in Brittany since the World War II allows to draw up a regional geography. Nine case studies on various conflicts lead to the comprehension of the conflicts' operation. There are two types of results. The former shows that the planning conflicts' geography is a function of the socio-space properties from the territory of reception and of the planning. Tha latter highlights the way in which the territory and the conflict are mutually nourished according to interactions of variable intensity. Overall, this thesis raises the question of the sustainable territorial insertion of planning projects.