"TGN:21512"^^ . "FTT:611"^^ . "ENVO:00000499"^^ . "trench"^^ . "Geonames:U.DEPU"^^ . . "trough (seafloor)"^^ . "EcoLexicon:trench"^^ . "SWEETRealm:Trench"^^ . "SWEETRealm:Trough"^^ . "A linear structural depression that extends laterally over a distance, while being less steep than a trench. A trough can be a narrow basin or a geologic rift. There are various oceanic troughs, troughs found under oceans; examples include the rift along the mid-oceanic ridge and the Cayman Trough."^^ . "FTT:1022"^^ . "ENVO"^^ . "deep"^^ . "trough"^^ . . "swale"^^ . "foredeep"^^ .