The windmills in the northern part of the Netherlands have been the keys to the control of the local water level for centuries, resulting in the formation of Amsterdam, an inhabitable city with a large network of waterways. Nowadays, in this city of wetlands where people and nature co-exist in harmony, the total size of the wetlands open to the public has reached 12,000 hectares. If you are already in this vibrant city or you are planning to visit there this April, take your opportunity to visit the surrounding wetlands.