This information is presented as a summary of what scientists, fishers and knowledgeable reef-folk have gleaned from decades of observations. The message is simple - everything is interconnected - and the story of these interconnections is best told as a journey in pictures. It's not rocket science, it's common sense, but most people are unaware that the Great Barrier Reef actually starts on land, high above the coastal plain. Intrigued? ... follow the blue highway to discover how most of what is essential to the health of the Great Barrier Reef is actually hidden from our view.