This interactive choropleth map visualizes the global prevalence of hypertension in 2019, filtered by sex. It uses a blue sequential color scale to encode prevalence values. Built with React and D3, the visualization employs `d3.geoPath` to render an SVG map, with country interactivity for tooltips and highlighting. The legend is generated using `d3.scaleSequential` and `d3.interpolateBlues`. Data originates from the WHO Global Health Observatory, loaded via `d3.csv` and `d3.json`.