Travel writer, Christina Dodwell, makes a return trip to Papua New Guinea, where she travels up the Sepik River to the head of the Wahgi River and goes down its life-threatening rapids with American whitewater rafters.
William Shawcross, a journalist who covered the Vietnam War, travels up the Mekong River starting in Vietnam, going through Cambodia including Angkor Wat, and ending in Thailand, discussing the turbulent political situation along the way.