This visualization displays the five boroughs of New York City as a blue SVG map, built using a GeoJSON dataset of borough boundaries. The map is rendered with a Mercator projection, centered on coordinates [-73.94, 40.50], and scaled to fit the 960×1160 viewport. Red circles mark four specific locations, including points in Manhattan and Queens, overlaid on the borough polygons. The example demonstrates how to load GeoJSON, compute a projection, and draw geographic features using D3 v5's geoPath and geoMercator.