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• Capitol Reef National Park (noun)
  1. a national park in Utah having colourful rock formations and desert plants and wildlife
• Great Barrier Reef
  1. the Great Barrier Reef the largest CORAL REEF in the world, off the northeast coast of Australia. It is around 2000 km (1250 miles) long.
• barrier reef (noun)
  1. a line of CORAL (= pink stone-like substance) separated from the shore by water
• coral reef (noun)
  1. a line of hard rocks formed by coral, found in warm sea water that is not very deep
• reef knot (noun)
  1. a double knot that cannot come undone easily [=  square knot American English]
• reef squirrelfish (noun)
  1. on reefs from Bermuda and Florida to northern South America
• reef whitetip shark (noun)
  1. smooth dogfish of Pacific and Indian Oceans and Red Sea having white-tipped dorsal and caudal fins
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