A nabkha, nebkha or nebka is a type of sand dune. Other terms used include coppice dune and dune hummock or hummocky dune, but these more accurately refer to similar, but different, sand dune types.[1] Authors have also used the terms phytogenic hillock,[2]bush-mound, shrub-coppice dune, knob dune, dune tumulus, rebdou, nebbe, and takouit.[3]
In simplest terms, a nabkha is a sand dune that forms around vegetation.[1][2] It is an aeolian landform, a structure built and shaped by the action of wind.[3]