The Tanoé-Ehy Marsh Forest (FMTE) has been identified as a high priority site for primate conservation in West Africa. Pending the completion of the measures to definitively classify it as a protected area, strong anthropogenic pressures continue to disturb the habitats contained in this site. The objective of the present study was to analyze the spatial and temporal evolution of this forest from 1986 to 2016, in relation to anthropogenic activities. The study consisted in mapping and monitoring the dynamics of the various biotopes that make up the FMTE using Landsat satellite images from 1986, 2000 and 2016, using Landsat satellite images from 1986, 2000 and 2016. To better understand the foundations of this evolution, surveys were carried out in 5 villages closest to the forest. Treatments show that 10% of the surface of swamp forests have been degraded to the benefit of degraded forests in 30 years. The temporarily flooded forests, however, remained intact during this period; this reflects FMTE's efforts to maintain the integrity of the FMTE. Investigations have shown that the types of pressure and their intensity vary between outlying villages. Overall, the degradation of the habitats of this forest is due to wood harvesting and hunting activities. Given the importance of FMTE in terms of specific ecosystems and the conservation of biodiversity, it is desirable and urgent that, in addition to awareness-raising campaigns for local populations, the process of its final classification be accelerated in order to end its degradation.