Flow Map
A Flow Map is the type used to visualize the movement of objects from one area to another (people migration, traded goods) by drawing lines with direction. Lines can have different thicknesses depending on how big the values are.
Flow Map (Basic)
Maps Connectors 09
Maps Marker 09
Sankey Diagram
A Sankey diagram visualizes flows (of any kind) and their quantities in proportion to one another. It represents nodes connected with one another by lines or arrows (the bigger the quantity, the wider the line). Sankey Diagrams are widely used in science, especially in physics.