The crossword solution for the term 'Silty Spot' is DELTA. A DELTA is a landform created by the deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water. Deltas are often triangular in shape, with the apex of the triangle pointing downstream. They are typically found at the mouths of large rivers, where the sediment is deposited in the slower-moving water.