The adjective dithalassos appears in Acts 27:41 to describe the 'place where two seas meet' — a sandbar or reef where Paul's ship ran aground during the Mediterranean shipwreck. The term is a nautical/geographical descriptor for a narrow passage between bodies of water.
Acts 27's shipwreck narrative is among the most detailed sea voyage accounts in ancient literature. The ship's grounding at a dithalassos — a perilous sandbar between waters — becomes the scene of miraculous salvation: all 276 souls reach shore safely, exactly as God had promised Paul. The geography of shipwreck becomes the geography of rescue, a microcosm of the gospel itself.