Kahuzi-Biega is the place in the world to meet an eastern lowland gorilla, the largest of all the great apes. The park lies in the east of the Democratic Republic of the Congo, in South Kivu province, west of Bukavu and Lake Kivu, and it covers a mix of lowland rainforest and the high forested slopes of two extinct volcanoes, Kahuzi at 3,308 metres and Biega at 2,790. Bamboo forest grows on the upper slopes, and the whole mass rises abruptly from the Albertine Rift, one of the richest areas for wildlife in Africa.
Tracking is the main activity, led by Congolese trackers who follow habituated gorilla families through dense undergrowth, and it can be a muddy, humid and rewarding scramble. A silverback may weigh over 200 kilograms, and a group often includes females, infants and a few blackbacks. The park has also been among the most threatened in Africa: it was listed as a World Heritage site in danger in 1997 because of civil war, mining and poaching, and gorilla numbers have fallen sharply over the decades. Local rangers have lost their lives protecting them.
The security situation in South Kivu has been unstable for years, with armed groups active across the province, and access to the park has been interrupted repeatedly. Check the latest official advice and with reliable local operators before planning anything, and do not rely on old guides. If the way is closed, the Rwandan side of Lake Kivu offers an alternative, with a good tarmac road running along the shore from Gisenyi to Cyangugu through hills of tea and banana, cool lake air and many viewpoints.
Bukavu, the city on the southern tip of the lake, is the nearest centre, with fuel and basic services, though prices are high and supplies are unreliable. Roads in the region can be poor, with potholes, landslides in the rainy season and checkpoints. Carry water, a repair kit and cash in small denominations, and take a local guide.
The dry season from June to August is the usual window, when the tracks are firmer and the forest is a little easier to move through.