Gorilla distribution map. Approximate current distribution of gorillas in Equatorial Africa. Gorilla gorilla gorilla refers to western lowland gorillas and Gorilla gorilla diehli to Cross River gorillas. East African gorillas are divided into Gorilla beringei beringei, also known as mountain gorillas and Gorilla beringei graueri, known as eastern lowland gorillas.
Thalmann et al. BMC Evolutionary Biology 2011 11:85 doi:10.1186/1471-2148-11-85