A land surface reduced by erosion to the general condition of a plain, but not wholly devoid of hills; a base-level plain.

a low, level or very gently rolling landscape that was created by long-term erosion.

low and nearly featureless land surface of considerable area which has been produced by the processes of long continued erosion.

A nearly flat surface that lies at an elevation close to sea level; thought to be the product of long-term erosion.

A smooth, rolling erosion surface that develops late in the cycle of erosion.

A land surface of regional scope worn down by erosion to a nearly flat or broadly undulating plain.

A lowland plain formed by erosion to the extent that rock structure and composition no longer influence the landscape. Supposed to be the end phase of an erosion cycle, which is an old concept that is not universally accepted.

An extensive erosion surface worn down almost to sea level. Subsequent tectonic activity can lift a peneplain to higher elevations.

a more or less level land surface representing and advanced stage of erosion undisturbed by crustal movements

A very late phase of a mature land surface, with very low relief and very gentle slope.

Conceptual model of a landscape that has undergone long periods of erosion and is reduced to a low relief or nearly planer surface;

a nearly flat erosional surface, usually near sea level, presumably produced by the long-continued processes of mass wasting, sheetwash, and stream erosion.

"A plain made by the wearing down of ancient mountains is usually spoken of as a peneplain — that is, a region worn down nearly to a plain in a place where, formerly, there was rougher topography. The wearing down has been accomplished in a long period of time by the erosive action of streams and the weather." (p 34)

An undulating surface of low relief formed by long-continued processes of erosion.

a formerly mountainous or hilly area reduced nearly to a plain by prolonged erosion. [AHDOS

A large flat or gently undulation area. Its formation is attributed to progressive erosion by rivers and rain, which continues until almost all the elevated portions of the land surface are worn down. When a peneplain is elevated, it may become a plateau which then forms the initial stages in the development of a second peneplain.

A broad, low, almost featureless surface allegedly created by long-continued erosion.

A peneplain is the final stage in fluvial or stream erosion. After the streams in an area have reached base level, lateral erosion is dominant as the streams erode the highland areas between them. Finally, virtually all of the upland is gone and the stream floodplains merge in an area of very low to no topographic relief.