Crossword clues for Niagara's source 4 lettersAnswerClueERIENiagara sourceERIENiagara Falls sourceERIENiagara's sourceERIESource of Niagara Falls' waterERIESource of Niagara FallsERIESource for Niagara FallsERIENiagara River sourceERIELake that's the source of the Niagara RiverERIESource of the Niagara RiverERIELake ___, source of the Niagara RiverERIEOne of the Niagara River's sourcesERIESource of the NiagaraERIELake source of the Niagara RiverXXXXLake that's the source of the Niagara RiverERIENiagara River's sourceERIENiagara River's lake sourceLAKEERIENiagara River's source