This visualization displays the borough boundaries of New York City as a blue SVG map, rendered using D3 v4’s geoMercator projection and geoPath. The map is centered on coordinates [-73.94, 40.70] and drawn from GeoJSON data. Three red circles are overlaid at fixed coordinate points, though their placement is inconsistent due to a coding error that uses the same value for both x and y positions, causing the markers to appear along a diagonal line rather than at their intended locations. The example demonstrates loading GeoJSON, projecting geographic features, and appending SVG elements.