The château-dotted area around the Loire River south of Paris is one of France’s most picturesque places to visit. It’s also where the natural wine movement established its roots. The long region is divided into four very diverse areas. The Central vineyards (upriver), known for its Sancerre and Pouilly-Fumé, produces some of the world’s finest sauvignon blancs, not to mention some pinot noirs that make for light reds and zippy rosés.