NE Pacific Tropical East Pacific Northern European Seas Northeast Pacific Southeast Pacific Northwest Atlantic Lusitanian Tropical West Atlantic Southwest Atlantic Tropical East Atlantic Southeast Atlantic Mediterranean Sea Temperate Australasia Northwest Pacific Western Indo-Pacific Central Indo-Pacific

Colors indicate the probability of invasion by ballast water exchange of cargo ships. Lines show the shortest path on water between two ports.
The method for link calculation and visualization was kindly provided by Dr. M. Gastner.