An interesting tidbit appears in a University of Notre Dame thesis by Eric C. Stewart (Gathered around Jesus: An Alternative Spatial Practice in the Gospel of Mark, pp. 261-2) referring to a study that argues Jesus’ voyage to the Gadarenes — where he exorcises the man possessed by Legion — is best read against the Greco-Roman traditions of sailing through the Straits of Gibraltar that were considered the gateways to land of the dead. (I have reformatted the paragraph for easier reading and added hyperlinks to the biblical references.)
Roy Kotansky argues that the story of the Gerasene demoniac is best read against the Greco-Roman traditions of sailing through the Straits of Gibraltar at the edge of the world.837
He first notes that the “other side” in Mark 4:35 has as its antecedent the sea in Mark 3:7.838 This sea is not identified in 3:7 as the Sea of Galilee. Kotansky argues that this sea should be read as the Mediterranean rather than the Sea of Galilee.839 The trip, then, becomes a voyage to the “Other Side,” that is, to the edges of the oikoumene. “Accordingly, all the sea-crossings of both miracle catenae, at least in the mythic imagination, are to be construed as true sea-voyages; their destinations, when recorded, will not tally well with known geographies of the circum-Galilean region.”840