A blindingly white description of a sun-parched landscape. Elsewhere Leigh Fermor conjures another type of blankness, that of a face, by describing it as tundra-blank.
Seeing ‘blankness’ repeated in this post, I conclude it is onomatopoeic, which is a good thing because it allows me to write onomatopoeic again and so remind myself of its spelling. All those vowels.  The key is to remember Edgar Allen in the middle of the word.
Regardless, I wish you freedom from blankness.
‘There was not a tree to relieve the skull-like blankness.’
Source: Patrick Leigh Fermor, Mani: Travels in the Southern Peloponnese, introduction by Michael Gorra, New York: New York Review of Books, 2006 (1958), p. 98