Data showing the delineation of the terrestrial ecoregion that characterises Mediterranean-climate forests, woodlands and scrub distinguished by their biodiversity features—species endemism, the rarity of higher taxa, species richness, unusual ecological or evolutionary phenomena, and global rarity of their habitat type. The source of this database is the Terrestrial Ecoregions of the World (TEOW) dataset by Olson et al. (2001). The TEOW dataset represents a biogeographic regionalization of the Earth's terrestrial biodiversity, in biogeographic units named ecoregions. The 867 terrestrial ecoregions are classified into 14 different biomes within the eight biogeographic realms.