This group collects the Landform Concepts subcategory's members that name and define broad, low-relief or structural upland surfaces and the terms geomorphologists use to describe long-term erosion and relief: peneplains, pediplains, etchplains, planation and erosion surfaces, dissected plateaus, terraces, benches, saddles, flatirons, outcrops and inverted relief. These are the subcategory's general-relief vocabulary, distinct from the specific agents of erosion (ice, water, wind) that shape the coastal, fluvial, glacial and aeolian groups elsewhere in this subcategory.