Surrounded by greens, we like to be green. We try to work in accordance with a responsible policy whenever possible. Tjermelân has a Green Key Gold certification and a ‘Waddengoud’ certification. De Riesen is Green Key Gold certified. A certification that states that we take an extra step by having an active environmental policy. For instance, by using sustainable lighting to light the park at night. This way the starry sky is very visible.