Voronoi Map of National Parks: the USA divided into regions based on which national park is closest
Source: wouj (reddit)
I was thinking about the Voronoi diagram of state capitals that’s been on here before, and it occurred to me that because national parks are often the destination of road trips, they would be a relatively useful subject for a Voronoi map. Hence, this submission!
One limitation: obviously, national parks are not point locations (there are nine states smaller than Wrangell-St. Elias NP…) For the 59 points on this map, I just used the locations of the national park labels on Google Maps, which are all pretty centrally located. This simplification throws off the “true” boundaries a little.
Edit: Many people are commenting about what does and doesn’t count as a national park. Here is an excellent, detailed map of the whole U.S. park system: http://www.nps.gov/hfc/carto/PDF/NPSmap2.pdf My map includes the 59 things explicitly designated “National Park”, which on that map includes anything ending in “NP” or “NP & PRES”. Yes there are many non-“National Park”s that are equally worth visiting, but that’s a job for another map.
And as long as I’m editing this post, three observations that struck me while I was making the map: 1. It’s kind of ironic that Hot Springs “owns” the largest “territory”, since it’s the smallest park (and really doesn’t fit in with the others in other respects - e.g. it’s located in an urban area). 2. I was genuinely shocked to learn that Isle Royale is the least visited national park in the lower 48, since I grew up in Minnesota where people talked about going there a lot! 3. I enjoy how Dry Tortugas, although it’s in Florida, manages to be the closest national park to nowhere in the continental US.