The Great Barrier Reef is a vast and complex ecosystem, so it doesn't have a single set of latitude and longitude coordinates. It stretches for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi).

However, you can provide a general location by giving the coordinates of its approximate center:

Latitude: 18.0667° S

Longitude: 147.4819° E

This will place you somewhere near the middle of the reef system.

For more specific locations within the Great Barrier Reef, you'll need to specify which area you're interested in.