Roughly every six hours, the sea recedes, revealing a unique and fascinating habitat: the mudflats. Amidst the silt, sand and small watercourses, a world teeming with life unfolds – from lugworms to mussels. The Wadden Sea is a UNESCO World Natural Heritage Site and ranks among the most productive ecosystems on Earth. Important: Please never venture out there alone; only do so as part of a guided tour, as the tide and sudden changes in the weather can become very rapid and dangerous here.