This visualization displays water quality measurements from villages in Uganda, plotting each sample as a rectangle positioned by latitude and longitude. The SVG rendering uses D3 v5’s `csv` loader to parse the tab-delimited data and `scaleLinear` for coordinate mapping. Each rectangle is appended via `selectAll('rect').data().enter()`, though the current code only sets a fixed 300-pixel width and height without encoding other variables. The example serves as a basic template for geospatial data plotting with D3’s data-binding approach.