Gorillas live in four parks in Uganda, Rwanda, and the Democratic Republic of the Congo (DRC).
In Uganda they are seen in Bwindi National Park and Mgahinga National Park. Bwindi in Uganda has four habituated families with 32 permits available daily. The gorillas there live in thicker tropical forest and tracking is more challenging as the hillsides are steeper and it can take 3-10 hours. Three of the families (Mubare, Habinyanja, and Rushegura) are accessed from Buhoma in the north. The fourth family, in Nkuringo in Southern Bwindi, is accessed from Kisoro. Access to this group is on a very steep trail. Mgahinga, in Uganda, is a great place to appreciate the unique Virunga volcanoes and has one habituated family, which is about 2-5 hours walk. Sometimes this group moves across the border and viewing is very erratic. You can track gorillas at Nkuringo in Southern Bwindi instead which is about 2 hours drive away. There are eight permits available.
Parc National Des Volcans (PNV) in Rwanda has seven habituated gorilla families (Group 13, Sabinyo, Amahoro, Umubano, Susa, Kwitonda and Hirwa). Most groups are half-day walks but Susa can take 7 hours. There are 36 permits available daily. Tracking in PNV and Mgahinga is usually easier than Bwindi as the afro-montane forest is lighter.
Djomba in the DRC also has a number of habituated gorilla families.