This area chart visualizes rainfall measurements over time, with a smooth curve showing yearly rainfall trends and a blue-filled region beneath the line emphasizing the data’s magnitude. The chart uses D3 v5 with SVG rendering, employing `scaleLinear` for both axes, `area` and `line` generators with `curveBasis` smoothing, and `axisBottom`/`axisLeft` for ticks. Data comes from a CSV file loaded via `csv()`, with year and rainfall values parsed as numbers.