Abstract : The basic principles governing zoning and tourism development in the Moroc- can mountain parks are examined by comparing the development plans drawn up for the Eastern High Atlas and Toubkal National Parks, and the Natural Parks of Ifrane (Middle Atlas) and Talassemetane (Rif)- The development proposals for each park are based on prior zoning of the land for tourism purposes using criteria such as ecological sensitivity, intensity of use, and the degree of autonomy of visitors. The main development principle adopted consists in combining measures to channel visitors (signs, zoning) with other measures to provide them with professional guides, the latter being used when the channelling techniques may present a risk to the natural environment. The success of park management plans is contingent upon setting up agreements, at both the local and national levels, between the public and private actors involved in tourism development.