Which preposition to use with flom

of Occurrences 2%

Aftre is the kyngdom of Mesopotayme, that begynnethe toward the est, to the flom of Tygre, unto a cytee that is clept Moselle: and it strecchethe toward the west, to the flom of Eufrate, unto a cytee that is clept Roianz: and in lengthe

Which preposition to use with  flom