Yup - it's just a set of maps - but very good ones,
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This review is from: The Lands of Ice and Fire (Song of Ice & Fire) (Hardcover)
4/5 for me as yeah, they are just maps, but very nicely thought out and designed maps, a very nice accompaniment to the books and series.
Once you have these then you'll know the world that Game of Thrones is set in and have a better idea of distances etc.
Consider seriously before buying; once you have looked through them once, what else will you actually do with them?