This type of map range from flow charts, which you'd see in a traditional business environment, to hybrids that adds flow charts elements and ideas of movement to more traditional maps. These might be used to show trade routes or flight plans. Volume can be indicated by the size of lines, for example. The map example shown highlights the migration flows of people in the greater Mekong region. Note, lines in this map show direction but not volume. Volume is detailed in the tables.
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