evidence: - Kinshasa is the capital and the largest city of the Democratic Republic of the Congo. It is on the Congo River. It faces Brazzaville, the capital of the neighboring Republic of the Congo, which can be seen in the distance across the wide Congo River, making them the two closest capital cities on Earth after Rome and the Vatican City. [...] - The Democratic Republic of the Congo is named for the Congo River, which flows through the entire country. The Congo River is the second longest river in Africa after Nile and the second largest river in the world by discharge volume of water (after the Amazon), and the world’s deepest river with measured depths in excess of 220 m (720 ft). - The area now known as the DRC was populated as early as 90,000 years ago, as shown by the 1988 discovery of the Semliki harpoon at Katanda, one of the oldest barbed harpoons ever found, believed to have been used to catch giant river catfish.