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From the creator:

The above map’s original data was created from a reference photo of a real human brain which was used to build the 3d terrain. This digital elevation model was then used to create contour line data, relief shading and to plan where the roads and features should be placed for map compilation. Real New Zealand public domain data was then added for the surrounding islands.

It looks a lot like the map I created after I did Tom Patterson’s Bryce Tutorial on Digital Elevation Models. I can only imagine how many more bodies of water, streams, rivers, hills, mountains, and cities are waiting to be discovered on that map.