Answer: Kinshasa
Explanation:
The capital city of the Democratic Republic of Congo is Kinshasa. It is the largest city in the country and one of the most populated in Africa with an estimated population of 15 million people.
Kinshasa is very close to Brazzaville which is the capital of the neighboring Republic of Congo with the two cities being so close that people in either city can see the other city from their respective cities.