Turks and Caicos is so blue because the clear sea water over white, sandy beaches reflect the blue sky.
The islands are home to one of the world's best barrier reefs. There are 340 miles of barrier reefs surrounding the Islands. These reefs create spectacular beaches with the finest white sands and shallow calm waters around the island.
When the sun shines in Turks and Caicos, as it generally does, the combination of clear water and white sands reflects the blue colour of the sky.