The Belize Barrier Reef is a 300-kilometer ( 190 mi ) long section of the 900-kilometer ( 560 mi ) Mesoamerican Barrier Reef System , which is continuous from Cancún on the north-eastern tip of the Yucatán Peninsula through the Riviera Maya and up to Honduras , making it one of the largest coral reef systems in the world after the Great Barrier Reef in Australia and the New Caledonia Barrier Reef .
The Belize Barrier Reef is a 300 kilometers ( 190 mi ) long section of the 900 kilometers ( 560 mi ) long Mesoamerican Barrier Reef System .