Symplēgadğs

Symplēgadğs (‘the clashing ones’), in Greek myth, the ‘clashing rocks’ at the north end of the Bosporus through which the Argonauts had to pass to enter the Black Sea. The rocks were believed to clash together, crushing ships that passed between them. The Planctae (‘wandering ones’) were similar rocks mentioned in the Odyssey (12. 61), in an unspecified place.