Bounded by the urban conglomerations of Amsterdam, Leiden, Rotterdam and Utrecht, the Groene Hart (Green Heart) of the Netherlands is a flat, relatively sparsely populated landscape of fields, woods, canals, lakes and villages. Nature is managed here with care and skill: in spring and summer the verges are bright with wildflowers, and there’s an abundance of birdlife. It’s a beautiful area for walking and cycling, or for trying out some of the numerous water sports on offer.