Rivers and LakesGeography Quiz Country CapitalsContinentsMountainsRivers and LakesFlagsOf the three rivers below, which is longest? MississippiDanubeAmazonLake Ontario is the source for which river? OhioSt. LawrenceYukonThe course of which river features the world\u0027s highest waterfall? a tributary of CaroniZambeziNiagaraWhat is the world\u0027s second-largest lake? SuperiorVictoriaOnegaWhich ocean features the greatest known depth? Caribbean SeaIndian OceanPacific Ocean Flags \t More Features !