TL;DR: Oldonyo Orok forest covers an area of 11,783 ha and lies on the slopes of a hill rising to 2,548 m which straddles the central Kenya-Tanzania border.
Abstract: Oldonyo Orok forest covers an area of 11,783 ha and lies on the slopes of Oldonyo Orok (‘the black mountain’), a hill rising to 2,548 m which straddles the central Kenya-Tanzania border. At lower levels, Acacia woodland merges into the dry bush and scrub of the forest-adjacent area, and it is only on the higher parts of the hill that thicker forest and larger tree species are found. The upper forest is dominated by Drypetes gerrardii and Diospyros abyssinica, with Calodendrum spp., Croton megalocarpus, Olea capensis, Cassipourea spp. and Nuxia congesta.