This visualization maps the locations of cholera deaths and water pumps during London's 1854 epidemic, overlaying them on a street network. The map displays individual death points colored red and pump locations in blue, with tooltips revealing each victim's age and gender from the death_age_sex.csv dataset. A second bar chart shows daily death counts over time. Using d3.json and d3.csv to load data, the code employs d3.scaleLinear for map coordinates, d3.line for streets, d3.zoom for panning, and SVG circles to render the data points.