Every map is built with popgrid, an open source Python package. Land maps rasterise each region's real territory into equal blocks. Population maps deform the regions with a contiguous cartogram so each one ends up with exactly its share of blocks, while keeping real borders and separate islands apart.

Boundaries come from Natural Earth admin-1. Population comes from national statistics offices. GDP (PPP, 2024) comes from the Kummu et al. gridded GDP dataset; where a country reports no regional GDP, its regional split is a model estimate and the map says so. Colours are fixed per region, so you can follow one region as it grows or shrinks.