boats with vacuumed pump are sucking sand form sand dune in mae khong or mekong river

activity are bank bar basin bason beach boat boats border brae cay countryside course dune embankment field flow form industrial industry khai khong landmark landscape mae mekong natural nature nong nongkhai place plain province pump river riverside rural sand scenery ship shore side stream suck sucking thailand top tube urban vacuum vacuumed vessel view water watershed waterway