This locator map displays London, UK, as the central point, surrounded by major cities with population data plotted on a Mercator projection. It uses D3.js's `geoPath` and `geoMercator` for geographic projection, `geoGraticule` for the reference grid, and RBush for collision detection to intelligently label cities without overlap. The map includes a scale bar and city labels, with data sourced from TopoJSON world geography and a CSV of world cities.