Question: When is a natural anomaly too small to qualify as a wonder? I am thinking of this in regards to possible natural wonders that were sacrificed in the real world. For example the fresh water Dolphins in the Yangtze-river in China that went extinct after the construction of the Three Gorges Dam. (The loss of nature and culture was a big concern before and during construction but nature and culture were ultimatel sacrificed for the perceived benefits in economy and security) A similar thing (albeit on a much smaller scale) happened in the Netherlands with the construction of the Zuiderzeeworks (which changed a salt inland sea into a freshwater lake). This project could have been (but wasn't due to econic restrictions) extended further into the Waddenzee, which by now is the nations least small (no big things fit in a country as small as the Netherlands) nature preserve.