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AWS Services · Concept

Availability Zone

An Availability Zone is an isolated location inside an AWS Region. Deploying across multiple Zones helps an application keep running when one Zone has a failure.

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Syntax

Availability Zone = AWS Region code + letter identifier (for example, us-east-1a)

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  • AWS Region
  • Local Zone
  • Wavelength Zone
  • regional resource
  • zonal resource
  • Availability Zone Independence

Source: AWS Regions and Availability Zones. Checked 2026-11-03.