Relating to or denoting the area behind an island arc.
 Example sentencesExamples
-  Like all other Mediterranean back-arc basins, extension in the central Aegean region was superimposed on a thick Alpine orogenic crust, which was shaped in Early Tertiary times.
 -  We propose that these sediments were deposited in a forearc or back-arc basin of the Oytag arc.
 -  What remains unclear is whether the rocks formed in an open ocean or a marginal back-arc basin associated with a subduction zone.
 -  The Kinik rocks have characteristics of ophiolites formed in oceanic or back-arc basins rather than island-arc settings based on a number of observations.
 -  Deformation is complex, with normal faulting and strike-slip faulting in the geomorphological back-arc basin.