Two rocky islands
Two small rocky islands directly to the west of the confluence of the Bosporus and the Pontus Euxinus, 2.3 km north of Garipçe Burnu, 100 m in front of the lighthouse of Rumelifeneri, modern İreke Taşı. In Greek myths they were identified with the dangerous Symplegades or Planctae (Hom. Od. 16,176; Apoll. Rhod. 2,317ff.). Here there was a shrine (Hdt. 4,85). Pompey built an altar in honour of Apollo here [1. 28f., 35-39].