Lewis & Short

Astăbŏres or -as, ae, m., = Ἀσταβόρας, a branch of the Nile in Ethiopia, now Tacazze or Atbara, Mel. 1, 9, 2; Plin. 5, 9, 10, § 53 (Jan, Astobores).
In Vitr. 8, 2, Astăbŏras; cf. Mann. Afr. I. pp. 170 and 177.