It’s one of the world’s most important rivers, bringing life to millions from Vietnam to China. That’s South East Asia’s enigmatic Mekong River, known as the ‘Mouth of Water’. Making an epic, 3,000-mile trip along it, is affable British presenter Sue Perkins (The Great British Baking Show). She finds a story of a river and a region at points of extraordinary change in a funny, life-affirming trip.