![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKVSfoqEL84fDkS9nI_HId6vUmvdXvGfV7hMoitPllx39_uKMb7gTsb0n54jfSkl0U2mQEqxGXEkkK-XRLsDgRASZ3c0RwJQ4drnqSkvcP9cuR5kN_UpiKl6GHb-ZaGbY51ISULzC1x89W/s400/drug+traffic.jpg)
Flow maps are are used to show movement through lines. This map shows the corridor flow of drug trafficking from the source zone of South America, to the transit zone of the Caribbean (40%) & Mexico (60%), and finally to the arrival zone of the United States.
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