A natural embankment that parallels the course of a river or bayou. A natural levee is built up over time by seasonal flooding of uncontained rivers and bayous. A natural levee is generally shorter and broader than an artificial levee.
A mound of sediment that parallels a stream channel forming a levee-like deposit. When flood waters leave the normal stream channel and enter the flood plain there is a reduction of velocity that causes suspended sediments to fall to the bottom, producing this deposit.
A long, broad low ridge or embankment of sand and coarse silt, built by a stream on its flood plain and along both sides of its channel, especially in time of flood when water overflowing the normal banks is forced to deposit the coarsest part of its load.