The Qu¶ng B×nh nearshore sandy formations are composed of medium to small-grained, white, grey-white, yellow-brown quartz sand of good roundness and sorting. They are distributed continuously along the shoreline from 0 to 20 m in elevation and from 0 to 60 m in depth in the form of barrier and dunes. Barriers are divided into 2 parts: the lower consists of marine barrier sand of quartz or some minerals of good and very good sorting and roundness; the upper - of dunes and barkhanes characterizing the eolian - marine formation occuring in regression phases.

The Qu¶ng B×nh coastal sand is formed from Early Pleistocene to Holocene depending to two factors: sea-level change and geological structure of linear block form together with syn-depositional tectonic movement, increasing the thickness of lagoonal plain and raising the horst considered as foot of sand barrier.

The forming and developing stages of Qu¶ng B×nh coastal sand happened in the mechanism of combination between coastal barrier and half-closed nearshore lagoon in the form of fulfilling lagoon. Dune sand is formed corresponding to regression phases with the main impact of wind.