of the land of the Artabrians in the northwest corner of Hispania. E. Thomas from the French BRGM showed in a 2004 report that tin mines were probably operated by the Romans at La Hye, near Ploërmel. This tin might have transited down the Oust river and the Vilaine river to the sea, where it could be transferred on seagoing ships, possibly at Pénestin, giving some support to de Beer's suggestion above. See also Tin mining in Britain Tin sources and trade in ancient times References Notes Primary sources Herodotus, Histories 3.115 Diodorus Siculus, Historical Library V. 21, 22, 38 Strabo, Geography 2.5.15, 3.2.9, 3.5.11 Pliny the Elder, Natural History IV. 119, VII. 197, XXXIV. 156–158 Secondary sources T. Rice Holmes, Ancient Britain (1907), appendix, identifies the Cassiterides with the British Isles. Louis Chauris, Les anciennes extractions d'étain à Piriac et à Pénestin. Leur place dans l'histoire des exploitations de Cassitérite en Bretagne. , Bulletin de l'Association bretonne, 131e congrès : Le Croisic - Guérande - La Baule, tome 113, 2004, page 380. E. Thomas et al., Carte Géologique de la France - Ploërmel, BRGM, 2004, see p 88-90 John Taylor, ''Albion: the earliest history" (Dublin, 2016) Phantom islands of the Atlantic Classical geography British Isles Ancient Greek geography of Britain