If my expedition includes both Brazzaville and Kinshasa, will this single eSIMAdventures plan provide coverage for both cities?

Unfortunately, no. While Brazzaville (Republic of the Congo) and Kinshasa (Democratic Republic of the Congo) are geographically close, separated only by the Congo River, they are in two distinct countries with separate mobile networks. This eSIMAdventures plan is only for the Republic of the Congo. If your adventure spans both nations, you will need either two separate country-specific eSIMs or a regional eSIM plan that explicitly lists both countries. Crossing the river means switching networks.