The sea as a barrier refers to the concept of the ocean serving as a natural impediment that separates lands and cultures, influencing trade, migration, and military strategies in ancient literature. In Greek and Roman epics, this motif often highlights the challenges faced by heroes on their journeys, symbolizing both physical distance and the psychological obstacles that accompany such voyages. The sea not only creates a divide but also embodies the idea of the unknown, often representing chaos, danger, and the unpredictable nature of human experience.
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