Lake Malawi is considered a biodiversity treasure because almost all its species occurs nowhere else on the planet.
Whatever the limitations of mediation -- even a painfully slow one -- Malawi stands to gain more from a consensual resolution in the boundary dispute with Tanzania.
Africa has had border disputes through the millennia. But the continent has its own peculiar problems, most because of colonialism. Luckily, there are examples of good practice to deal with problems.