The team look at how rivers and waterways have shaped our landscape. Matt Baker is on the Thames Estuary to meet a writer who draws inspiration from the estuary and its people. He also meets the Port Authority staff who oversee some 30,000 annual ship movements, jumps on the foot ferry that once would have brought livestock into the city and meets an artist making beautiful things from the flotsam brought in on the tide. Sean Fletcher is just a few miles from Matt, finding out what it takes to turn a landfill site into a thriving nature reserve. And Naomi Wilkinson is in Devon at the beautiful Lydford Gorge, meeting a photographer captivated by its waterfall and whose pictures have become an internet sensation. Naomi then takes to the oldest shipping canal in Britain on a paddleboard! Meanwhile, Adam visits Widecombe Fair in Devon - one of the country's last traditional country fairs. And with the badger cull once again well underway, Tom Heap explores the science around bovine TB.