"City on the opposite side of Kinshasa" is oddly-worded. It's on the opposite side of the Congo River from Kinshasa, but a city itself does not have an "opposite side." It has cities to the north, south, east, and west. Which one is the "opposite" side? I got the answer, as I expect will anyone who knows that Kinshasa and Brazzaville are right next to each other, but you should probably just reword this to say "City right across the Congo River from Kinshasa." Or at least "on the opposite side of the Congo River from Kinshasa."