The correct answer is - freshwater resources.
Uganda, Rwanda, and Burundi, are sub-Saharan African countries. All three are landlocked, thus they do not have access to sea or ocean waters.
Despite the fact that these countries are landlocked, they are not in such a bad position as they have a lot of freshwater resources, with all of them having lakes on their territories, which often are borders, but also connectors with the other nations.
They also have multiple rivers, some of which start their flow on their territories, while some having their main flow through their territories, with the most noticeable being the Nile River.
