This choropleth map visualizes global deaths from brain and central nervous system cancer for 2019, using a yellow-orange-red sequential color scale to encode mortality counts by country. The visualization uses React for component structure and D3 v7 APIs including `d3.geoNaturalEarth1`, `d3.geoPath`, and `d3.scaleSequential` to render the map, with TopoJSON world atlas data for country boundaries. A legend displays graduated color swatches, and hovering over a country reveals its name and total death count via D3 selections on a DOM overlay.