One of the major natural dangers facing any non-arid plains area is flooding. This is particularly so if there is a nearby river. As a country on the Great Plain of Europe and crossed by numerous rivers, the Dutch developed some of the most sophisticated flood control techniques the world has ever seen. Perhaps the best place to see this is in the area around Kinderdijk, a small town in South Holland near the confluence of several rivers. See Kinderdijk from above, compliments of contributor Pepinair.