No, that's a map of the parts of the Netherlands which were underwater. Here: https://commons.wikimedia.org/wiki/File:Oceans_and_seas_boundaries_map-en.svg ht

No, that's a map of the parts of the Netherlands which were underwater. Here: https://commons.wikimedia.org/wiki/File:Oceans_and_seas_boundaries_map-en.svg https://commons.wikimedia.org/wiki/File:Oceans_and_seas_boun... is a map of the parts of the Netherlands that are under water (highlighted in blue). They haven't colonized those parts yet. But as you say, they don't think they are done. Or you may prefer the map at the bottom of the page on https://what-if.xkcd.com/53/ https://what-if.xkcd.com/53/ depending on how you think global warming will play out.