Question

where is deltial soil ???

Answer 1

your questions is wrong I think in deltial place there might be delta

Answer 2

A river delta is a landform that forms from deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarely) another river that cannot carry away the supplied sediment.