From OpenStreetMap Wiki
Landforms are drawing elements which inform about local topology. At the moment (summer 2012) only few of them are rendered by Mapnik.
|Example||Descriptions and Remarks||Tagging||OSM-Map|
|two sided embankment||nn|
|300px||single sided embankment, decline on right side of line (== single sided cutting)|||
|300px||single sided cliff, decline on right side of line|||
|two sided cutting||nn|