interregional

adjective
in·​ter·​re·​gion·​al | \ˌin-tər-ˈrēj-nəl, -ˈrē-jə-nᵊl\
variants: or less commonly inter-regional

Definition of interregional 

: occurring between, or existing between two or more regions interregional communication/trade

First Known Use of interregional

1871, in the meaning defined above

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