9. Strait of Gibraltar
The Strait of Gibraltar is a narrow waterway connecting the Mediterranean Sea to the Atlantic Ocean, separating southern Spain from northwestern Africa. Spanning 36 miles (58 kilometers) in length and narrowing to 8 miles (13 kilometers) in width, it has been a critical maritime passage since ancient times. The Greeks referred to it as the Pillars of Heracles, marking the boundary of the known world. Its strategic importance has been underscored by numerous historical events, including the Battle of Trafalgar in 1805, which solidified British naval dominance. Today, the strait remains vital for global shipping, with approximately 100,000 vessels transiting annually, carrying about 20% of global seaborne trade.
