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  1. 20 Sea Creatures More Dangerous Than Sharks - Best Life

  2. What are considered rough seas? - Geographic Pedia - NCESC

  3. The 8 Roughest Seas For Cruise Ships (RANKED!)

  4. The 8 Roughest Seas In The World For Cruise Ships - Cruise Mummy

  5. The World's Roughest Waters for Cruising - Cruise Critic

  6. The 10 Roughest Seas in the World for Cruise Ships

  7. ‘Like going to the moon’: The world’s most terrifying ocean crossing

  8. Sea state - Wikipedia

  9. The World's Roughest Seas - SEA CHEST

  10. The World's Roughest Cruise Itineraries | Condé Nast Traveler