Russell and Carol - hayle and hearty

I had an internet moment today, looking up something lead to something else, which lead to something else which lead to this beautiful picture

Many thanks to the unknown blogger and SRTM.

As the unknown blogger said "I was looking up Earth surface elevation data today (from SRTM),
and I was blown away by the amazing fractal structure of mountain and
valley systems. Here's a small scaled-down sample of the dataset around
Sydney, on which I've labelled Sydney and Newcastle to illustrate the
scale. Brightness indicates elevation."