For the reference, see BNF citation. This map is a direct copy of the relevant map of Syria in the Liber of Marino Sanuto. See also Campbell (2011: Supp. A)
Crone (1938: p.262). Crone (1937) notes the elasticity of the exact location of Hercules's pillars in 15th-century charts. Cortesão (1954 (1975):p.74) notes that an inscription about Hercules's "statues" to mark the edge of safe navigation was common practice in Arab charts.
For the reference, see BNF citation. This map is a direct copy of the relevant map of Syria in the Liber of Marino Sanuto. See also Campbell (2011: Supp. A)