S1, E4: Joanna is on the final part of her journey. In Southern Sudan she flies over the world's largest swamp, the Sudd, and in the main town of Juba she finds that a fragile peace process has brought about a re-emergence of beauty pageants. From Juba, Joanna heads into Uganda where she follows the White Nile up to the famed Murchison Falls, and meets a modern-day adventurer who shows her a new source of the Nile.