"virtually un-trodden"

Wilfred Thesiger describes a similar feeling in Arabian Sands:

But I knew instinctively that it was the very hardness of life in the desert which drew me back there – it was the same pull which takes men back to the polar ice, to high mountains, and to the sea. To return to the Empty Quarter would be to answer a challenge, and to remain there for long would test myself to the limit. Much of it was unexplored. It was one of the very few places left where I could satisfy an urge to go where others had not been.