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Azure's zones are "physically separate", but it's unclear whether zones could be in the same building. Especially since they don't guarantee distance between zones - they just aim for 300mi (483km)

Actually I assumed AWS did it the same way as the others - I thought maybe they are in another building on a campus but I didn’t think that should be a factor in planning and that I should use regions for geographic redundancy anyway.

Afaik AWS AZs are physically separate. I think some maps exist. Around here, there's 3 AZs and they're multi building campuses about 10-20 miles apart situated in suburbs outside the city freeway belt.

Yeah I definitely thought they were physically separate - I thought that an AZ might span multiple data centres too (could be wrong) and I thought they had to be at least 10km apart.

Thanks for highlighting this. Indeed all CSPs are not the same