Having the style, characteristics, or manner of a gazetteer; resembling or relating to geographical reference materials or descriptions.
From 'gazetteer' (a geographical reference book or writer) plus '-ish' (a suffix meaning resembling); 'gazetteer' comes from Italian 'gazzetta' (newspaper), which originally meant a small coin paid for news.
The word 'gazetteer' has a hilarious origin—it basically meant 'person who writes for newspaper money'—and '-ish' endings are incredibly flexible in English, letting you turn almost any noun into an adjective describing that quality or style.
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