Overview: Join Alan Titchmarsh as he travels from the river’s source to the sea, to reveal the beauty and spectacle of Freshwater Britain. Discover the real Loch Ness Monsters, the venomous mammal stalking the Hampshire countryside, and the unexpectedly romantic side of the predatory pike. Watch kingfishers diving, salmon leaping and a songbird that swims underwater. And find out why a drop of rain is the key to keeping all this wonder and beauty alive.