Democratic Republic of the Congo–Rwanda border
The border between the countries of Rwanda and the Democratic Republic of the Congo is 221 kilometers long. Crossing Lake Kivu in its entirety through the Virunga Mountains down to Mount Karisimbi, it divides the cities of Goma/Gisenyi and Bukavu/Cyangugu.
Source: Wikipedia — Democratic Republic of the Congo–Rwanda border (CC BY-SA 4.0)