The geological process by which a river deposits sediment and builds out a delta formation, extending land into a water body.
From 'delta' (the triangular Greek letter and landform) combined with '-fication' (meaning 'the process of becoming'). A technical term used primarily in geology and earth science.
Rivers like the Nile and Mississippi are constantly remaking Earth's coastline through deltafication—they carry millions of tons of sediment daily, and over centuries this reshapes maps and creates new islands, a process so powerful it literally changes national borders.
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