Located in the northeast of Algeria, the forest of Souk Ahras and, more precisely, the forest of Ouled Bechih occupies an area of 6,582 hectares. The diversity of these ecosystems  is one of the most beautiful wet forests in North Africa and can be described in this area thanks to its geographical position and biotic and abiotic diversity. And it is considered a regional park in the heart of creation. This area is north of the Wilaya of Souk-Ahras, whose climate is of Mediterranean type, characterized by an average annual temperature of 16°C and average annual precipitation of 625 mm, with high atmospheric humidity of 68%. This forest has been the subject of a study whose objectives are to assess and determine the diversity and botanical richness of this forest environment. This study collected floristic data using the botanical mobile inventory method. This method consists of going through the forest of Ouled Bechih (Souk-Aras) in different directions and identifying all the plant species encountered without considering their abundance or size. Plots were counted in each type of vegetation in this forest. The results indicate that the forest covers a wealth of 45 plant species grouped into 44 genera and 28 families. The floristic composition shows there is an important richness and diversity in this rainforest. This diversity changes with the altitude factor and the type of plant formation, where cork oak forest has been found to be the densest and most abundant of plant species compared to zeen oak forest and the mixed transitional forest of cork oak with zeen oak. The conservation of this biodiversity must be part of a sustainable management approach that will protect existing heritage and improve the socio-economic conditions of local populations.