has part has part has_part has quality has quality depressed landform Geonames:T.PANS non tidal basin TGN:21521 depression pans EcoLexicon:depression SWEETRealm:Depression A landform sunken or depressed below the surrounding area. pan (geologic) Geonames:T.DPR tidal basin FTT:175 Geonames:T.PAN TGN:21497 TGN:21454 barrier basin FTT:215 FTT:216 Clarify that this pertains to the planetary crust and create superclass for general topological depressions. https://github.com/EnvironmentOntology/envo/issues/486 depression pan slope landform decreased elevation sloped downward