Answer: lakebed

AnswerCrossword Clue
LAKEBEDHole which holds a whole lot of water
LAKEBEDWet floor?
LAKEBEDSuperior's low point
LAKEBEDFossil site, perhaps
LAKEBEDSuperior bottom
LAKEBEDSilt locale
LAKEBEDLarge depression for water
lakebedThe floor or bottom of a lake
lakebedthe floor of a lake