circumdenudation

from The Century Dictionary.

• noun In geology, erosion of such a character that isolated hills are left as the result of the denuding or erosive action.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Geol.) Denudation around or in the neighborhood of an object.
• noun hills which have been produced by surface erosion; the elevations which have been left, after denudation of a mass of high ground.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun geology denudation around an object