Which preposition to use with riber

in Occurrences 4%

so 'twasn't long 'fore I heered 'bout han's beein' needed down de riber in Mississippi and dats where I went en stayed for two years and boss, I sure was struck wid dat lan' what you could make a bale to a acre on an' I just knowed dat

from Occurrences 2%

And den he says dat he gwine fin' him some good lan' mebbe in Arkansas down de riber from Memfis.

Which preposition to use with  riber