Amargosa River (ah-mahr-GO-suh), intermittent stream; S Nev. and E Calif., rising in Pahute Mesa, Nev. c.40 mi/64 km N of Beatty, Nev.; flowing S; flows underground through Beatty then past Amargosa, Calif., E of Amargosa Range, then turns NNW to W side of range, to sink into Death Valley, Calif., meeting intermittent Salt Creek from N.