 In return for this favor, Phineas revealed to Jason the location of Colchis and how to pass the Symplegades, or The Clashing Rocks, and then they parted.The only way to reach Colchis was to sail through the Symplegades (Clashing Rocks), huge rock cliffs that came together and crushed anything that traveled between them.Phineas told Jason to release a dove when they approached these islands, and if the dove made it through, to row with all their might.