AWS in contrast likes to spread things out more, like in Northern Virginia where they have 5 different AZs that are supplied from different electrical substations and confer some 'more than one block down the street' geographic separation. While a bunch of them are in the usual Ashburn-Sterling-Dulles triangle on north of Dulles Airport, there's also ones in Chantilly on the south side of the airport, and past Manassas another 15 miles out.

When AWS rolled out in Ohio, they did the same thing [1], locating two of them in the suburbs northwest of Columbus and one northeast, or in Sweden where they're in Västerås and Eskilstuna on opposite sides of a large lake, and a third in Katerineholm another 50 km out.

[1] https://news.ycombinator.com/item?id=12730012

Seems they might share fibre susceptible to excavators, etc. I guess they've probably thought of that ;)