I would like to guess the answer is distilled water but I'm not positive
Consolidating name geology
<span>A floodplain or flood plain is an area of land adjacent to a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls </span>
delta IDK
relating to or derived from alluv
<span>An oxbow lake is a U-shaped body of water that forms when a wide meander from the main stem of a river is cut off</span>ium
hope it helps :)
It is the most northern extreme.
