This visualization displays a world map with circles positioned at the coordinates of cities. The size of each circle is proportional to the city's population, using a square root scale to visually encode the data. Built with React and D3 version 5, the map uses the `geoNaturalEarth1` projection and `geoPath` to render land, graticules, and country interiors from World Atlas TopoJSON. City data is loaded from a CSV file, and the visualization is rendered as SVG.