41. Tours : Quicksilver is the area's leading day-tour operator to the Great Barrier Reef . 42. The Great Barrier Reef is a distinct feature of the East Australian Cordillera division. 43. Rebolledo selected Xcalak because two natural entrances through the barrier reef would permit navigation. 44. These were used to carry out a photographic survey of the Great Barrier Reef . 45. The run to the barrier reef took about 45 minutes. 46. It encompasses 700 square km and is protected by a double barrier reef system. 47. Family quarters are increasing in the quiet Turks and Caicos, surrounded by barrier reefs . 48. Many tourists visit Queensland to see the Great Barrier Reef . 49. The Belize Barrier Reef has been affected by mass-bleaching events. 50. This shrine marks a break in the barrier reef that is opposite the site.
