A Quenya cognate of S. lhô appearing in The Rivers and Beacon-hills of Gondor from the end of the 1960s, rejected when Tolkien revised the primitive form {✶sloga >>} ✶loga and the Sindarin form {lhô >>} lô (VT42/9-10). I personally prefer the earlier form S. lhô which Tolkien used prior to 1968, and as such I think ᴺQ. hlöa “flood, fenland” is salvagable for purposes of Neo-Eldarin, as a derivative of an s-prefixed variant of √LOG. See the entry on S. l(h)ô for further discussion.