> I don't think there is a distance limit between AZs but instead a latency limit Ok, fleshing that out via google: "The connection between AZs is expected to

> I don't think there is a distance limit between AZs but instead a latency limit Ok, fleshing that out via google: "The connection between AZs is expected to typically achieve low single-digit millisecond latency between them on average." https://knowledgebase.progress.com/articles/Article/expected-latency-between-aws-availability-zones https://knowledgebase.progress.com/articles/Article/expected... and 1 light-millisecond = 299792.458 meters, so nearly 300 km / 186 miles. https://www.translatorscafe.com/unit-converter/en-US/length/95-1/ https://www.translatorscafe.com/unit-converter/en-US/length/... So in 2 milliseconds, light travels 599km or 372 miles. That's a _hard_ limit. IIRC, modern communications is at a fraction of lightspeed, which would lower it. There's no reason _not_ to have the AZs for a region in the same metro area, so separated by 10s of km, tops. 10km = 0.0333 light-milliseconds.