A cruise into Indonesia's coral triangle

Looking through the aircraft window, it is hard to believe I am flying above the fourth most populous country in the world. Below stretch scenes so unspoilt and Technicolor in their intensity that they seem more Pixar creation than crowded planet. In the distance, dozens of tiny, amorphous islands ringed by white sands then turquoise shallows appear to float in the sea. Lurid green forests extend to the horizon – but of the 240 million people living in Indonesia, there is no sign. There are no roads, no towns, no harbours, just hundreds of miles of virgin Earth.