This interactive map displays immigration flows to Russia from various countries for the year 2020, using a natural Earth projection. Users can click on any highlighted country to filter and visualize only the migration paths originating from that selection. The map encodes the volume of immigrants through both color intensity and stroke width on the curved flow lines, which are drawn as geographic paths between origin and destination coordinates. Built with React and D3 v5, the visualization leverages `d3.geoNaturalEarth1`, `d3.geoPath`, and `d3.geoGraticule` for map rendering, while processing CSV data loaded via `d3.csv`.