The recent RADL GRVL event kindly shown by Troy Brosnan in the linked video is a good indication of what 'Gravel' riders expect.
As with anything, the local terrain is the defining factor in how the term is used.
There are parts of this that are basically gravel coloured road, also a good slice of evidence for
@Haakon and the 2x setup. The amount of people walking the hills is very amusing.
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For what it's worth, the top three were Tasman Nankervis, Brendan 'Trekky' Johnston and Adam Blazevic - all MTB'ers first