Sigman

SIGMAN (Σίγμαν), a river in Gallia. Ptolemy (Ptol. 2.7.2) places the mouth of the Sigman between the Aturis (Adour) and the Garonne; and between the Sigman and the Garonne he places Curianum Promontorium. [CURIANUM] Marcianus (Peripl. ), who has the name Signatius, gives two distances between the mouth of the Adour and that of the Sigman, one of which is 500 and the other 450 stadia. We cannot trust either the latitudes of Ptolemy or the distances of Marcian along this coast. There is no river between the Adour and the Garonne that we can suppose to have been marked down by the ancient coasting ships to the exclusion of the Leyre, which flows into the Bassin d'Arcachon. But Gosselin supposes the Sigman to be the Mimisan, which is about half-way between the Adour and the Bassin d'Arcachon.