Region Pair
Two Azure regions paired at least 300 miles apart for replication and disaster recovery.
An Azure region pair is two regions within the same geography that Microsoft designates as each other’s recovery partner, typically separated by at least 300 miles. Platform updates roll out to only one region in a pair at a time, and during a broad outage Microsoft prioritizes restoring at least one region in every pair. Region pairs differ from Availability Zones, which protect against failures inside a single region using physically separate datacenters. Because a pair stays within one geopolitical boundary, data residency is preserved for compliance.
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