[German version]

(πρασώδης θάλασσα/prasṓdēs thálassa, the 'green sea'). Described by Ptol. 7,2,1 and 7,3,6, Marcianus [1] (Periplus maris exteri 1,44 = GGM 1,44) and Anon. Geographia Compendiaria 32 (= GGM 2,32) as the part of the region of the Indian Ocean that is coloured by a leek-like "sea moss". The appearance of this seaweed points to a shallow zone probably close to a coastline, which could have been near the East African coast north of Zanzibar. From the Augustinian era on, Greco-Roman ships reached th…