While "best" is subjective, Exuma in the Bahamas is widely regarded by oceanographers and luxury travelers as having the clearest, most vibrant "electric blue" water in the Caribbean, if not the world. The unique clarity is due to the shallow calcium-carbonate sand banks that reflect sunlight, combined with a lack of runoff from major rivers that would otherwise introduce sediment. Other top contenders for "best water" include Grand Cayman for its incredible visibility—often exceeding 100 feet—making it a mecca for divers, and Turks and Caicos, specifically Grace Bay, which features a stunning transition from pale turquoise to deep indigo. In 2026, many travelers also point to the "gin-clear" waters of Shoal Bay in Anguilla, where the water is so transparent that you can see your own shadow on the sandy bottom while swimming. These islands benefit from being "low-lying" coral islands, meaning they don't have the volcanic soil or heavy rainfall that causes the "murky" water found on more mountainous islands like St. Lucia or Dominica.