From site: Worldmapper is a collection of world maps, where territories are re-sized on each map according to the subject of interest. There are now nearly 600 maps. Maps 1-366 are also available as PDF posters.
The maps and data files cover 200 territories, mainly United Nation Member States plus a few others to include at least 99.95% of the world’s population. For a map identifying them see the labelled territory map, and for a cartogram giving them all equal prominence see Appendix A (Areas Included). Further details about their names are given in Technical Notes for Land Area. Also shown on the maps are 62 other areas, mostly small islands, which do not have unique data but are assigned to and included in the data of the 200.
The maps presented on this website are equal area cartograms, otherwise known as density-equalising maps. The cartogram re-sizes each territory according to the variable being mapped.