This map shows the distribution of cities in Turkey, colored by region. The visualization uses a D3 geoEqualEarth projection and d3.geoPath to render the topojson features, with an ordinal color scale based on d3-scale-chromatic. A linked legend, built with custom SVG elements, allows users to filter regions by clicking, and the map supports pan and zoom via d3.zoom. The data comes from a CSV file of city-level analytics metrics.