This scatter plot visualizes the Iris dataset, mapping petal width and sepal length with points colored by species. A circular color legend identifies the three species categories. The visualization uses D3 v5 with the `d3.scaleLinear` for axes, `d3.scaleOrdinal` with `d3.schemeCategory10` for colors, and the `d3.legendColor` library for the legend. Grid lines extend across the chart via tick size settings, and axis labels are rotated for the y-axis. The data is loaded from a CSV file via `d3.csv`.