Plotly Large Dataset Sankey Choropleth Infographic

Data visualization infographic titled "Choropleth Map Example" using a SANKEY FLOW as the dominant visual element to show progress through a geographic data pipeline. Main graphic: a large left-to-right Sankey flow with thick, clearly separated streams and sharp English labels, showing stages such as "Raw records", "Geocoded", "Validated", "Mapped regions", and "Final choropleth output" with realistic illustrative values like 1,200,000 → 980,000 → 910,000 → 860,000 → 840,000. Include precise tick marks and a small horizontal progress scale in English from "0" to "1,200,000 records" to avoid misleading scale manipulation. Integrate a small secondary inset map as a choropleth example preview labeled "Example choropleth preview" with regions shaded from red to green and a compact legend labeled "Low value" to "High value". Add 4 key insight callouts with headline numbers, short interpretations in English, and small icons: "70%" — "Most records are ready after geocoding" with pin icon; "91%" — "Validation retains the majority of usable rows" with check icon; "860k" — "Regional mapping is the main narrowing step" with map icon; "840k" — "Final dataset is large enough for interactive analysis" with dashboard icon. Use hand-drawn annotation arrows, circled notes, sketch underlines, and marginal notes in a hand-annotated sketchnote style, but keep the chart geometry clean and readable. Visual style: hand-annotated sketchnote, high-contrast red & green palette, off-white paper background, black ink outlines, red for drop-off or incomplete stages, green for successful progress, subtle gray connectors, energetic newsroom mood. Add a compact legend in English with quoted labels "Drop-off", "Completed", and "Illustrative values". Include a small SOURCE / DATA-NOTE strip at the bottom in English reading: "Data note: Illustrative example only. Figures are illustrative and not sourced unless user-provided." Ensure editorial data journalism illustration, FT / Bloomberg-grade chart aesthetics, vector-clean infographic layout. All text MUST be written in English (array). Every heading, label, caption, legend and metric name in the image must be in English — not English. Spell each English word correctly using English characters and diacritics. Numbers stay as digits, no fake authoritative sources cited, no watermarks Numbers labeled "illustrative" unless the user supplied specific sourced data. No fake authoritative sources cited (do not invent "Source: Reuters 2025" — use "Illustrative example" instead). No misleading axis truncation or scale manipulation.