"FTT:144"^^ . "Wikipedia:Natural_arch"^^ . "ENVO"^^ . "arches (natural formation)"^^ . . "FTT:142"^^ . "natural bridge"^^ . "A natural formation where a rock arch forms, with a natural passageway through underneath."^^ . "sea arch"^^ . "natural arch"^^ . "ENVO:00000414"^^ . "TGN:21445"^^ . "FTT:143"^^ . .