The public maritime domain is legally well defined. The space which it recovers is at the crossroads of major stakes, between land and sea. Natural risks, as technological risks, affect this area. The integrated coastal zone management submits the competent authorities to renew their approach of these areas. Consequently, it can be noticed that the traditional approach of the public maritime domain reveals its own limits, but the appreciation must be moderated and leads to distinguish between a question of natural risks or technological risks. On the other hand, it appears significantly that the stakes inherent to the situation of the public maritime domain require an integrated approach, taking into account particularly the contrasted objectives of which it is the stake. This resulted in redefining the methods of the governorship there. In conclusion, it appears well that economic, social and ecological impact of climate change on these fragile areas also implies to stick finally to causalities of these phenomena.