Gombe NATIONAL PARK
52 sq km (20 sq miles), Tanzania’s smallest park.
16 km (10 miles) north of Kigoma on the shore of Lake Tanganyika in western Tanzania.
Kigoma is connected to Dar and Arusha by scheduled flights, to Dar and Mwanza by a slow rail service, to Mwanza, Dar and Mbeya by a slow rail service, to Mpulungu in Zambia by a weekly ferry. From Kigoma, local lake-taxis take up to three hours to reach Gombe, or motorboats can be chartered, taking less than one hour.
Chimpanzee trekking, hiking, swimming/snorkeling, visit the site of Henry Stanley’s famous ‘Dr Livingstone I presume’ at Ujiji near Kigoma, and watch the renowned show builders at work.
The chimps don’t roam as far in the wet season (February-June, November-mid December) so may be easier to find, better picture opportunities in the dry (July-October and late December)
Source: Tanzania National Parks
which include this area: