"lake bottom"^^ . _:b1216489 . "lake bed"^^ . _:b1216491 _:b1216490 . _:b1216490 _:b1216489 . _:b1216489 . _:b1216488 . _:b1216488 . "ENVO"^^ . _:b1216492 . _:b1216490 . . . "lake"^^ . . _:b1216488 _:b1216491 . "ENVO:00000268"^^ . _:b1216492 . _:b1216491 . _:b1216492 . "FTT:804"^^ . "The ground surface that lies beneath a lake."^^ . _:b1216489 . _:b1216492 . "FTT:221"^^ .