Well I've finished it.
Took me forever.
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The quarter scale image on the box was little help, especially as the shading was far darker than in the puzzle, so a lot of detail was hidden. Identification was hard so when I found a place name I started resorting to Google to tell me where it was. Far easier than peering through a magnifying glass.
When I was about 75% through I sorted pieces into piles of similar shapes - 3 holes and one out, 3 outs and one hole etc. Then I just worked through the spaces.
I never thought of giving up, but I do have a fetish for maps, but this wasn't really pleasurable to do. Just a long slog. I won't be repeating it. Anyone want it for the price of postage?