The Mahale Mountains National Park is also a sanctuary of Chimpanzees but with five times more than in the Gombe Stream National Park.

It houses also 6 other Primate varieties.

The Mahale Mountains National Park has a special situation with its mountain range and its tropical forest. It overlooks Lake Tanganyika; the World’s longest, second-deepest and least-polluted freshwater Lake.

The best moment to see the Chimpanzees is from May to October during the dry season.

Source: http://www.tanzaniaparks.com/mahale.html