Conservation targets: A flat regional pediplain having pure water vulnerable to pollution, where the concentration of dissolved and suspended solids is universally low; easy-to-erode soils and sediments covered in some places by a root mat that limits erosion and retains nutrients necessary for plants and animals; certain combinations of water regime, substrate, and topography that support distinct environments; the deposition of conglomerates cemented by manganese dioxide which in some rapids may also be important to channel stabilization