This interactive map visualizes age-standardized hypertension prevalence among adults aged 30-79 across countries, using 2019 WHO Global Health Observatory data. Users can filter results by sex through a dropdown. A sequential blue color scale encodes prevalence percentages, with a gradient legend and hover tooltips displaying exact values. The application is built with React and D3.js (d3.geoPath, d3.geoNaturalEarth1, d3.geoGraticule) to render an SVG world map from TopoJSON data, while d3.scaleSequential and interpolateBlues drive the color encoding.