Region
A geographic area a provider operates in (e.g. “US East”), made up of multiple isolated locations. Most resources are created within a single region.
Cloud fundamentals
Regions, Zones & Edge Locations
The cloud isn't one giant computer somewhere — it's a hierarchy of physical locations, and where you place things changes latency, resilience, and compliance.
Availability Zone
One isolated location within a region — its own power, cooling, and networking — so a failure in one zone shouldn't take down the others.
Edge location
A smaller facility, in far more cities than regions exist, used to cache or serve content close to end users — the mechanism behind a CDN.
Same hierarchy, different names
AWS, Azure, and GCP all use a region → zone → edge hierarchy — the terms just don't line up one-to-one.
| Concept | AWS | Azure | GCP |
|---|---|---|---|
| Region | Region (e.g. us-east-1) | Region (e.g. East US) | Region (e.g. us-central1) |
| Isolated location within a region | Availability Zone (AZ) | Availability Zone | Zone |
| Points close to end users for low-latency delivery | Edge Location / CloudFront PoP | Point of Presence (Azure Front Door) | Edge Point of Presence (Cloud CDN) |
Why the choice matters
Picking a region or spreading across zones isn't just an ops detail — it's a design decision with real tradeoffs.
Latency
Picking a region close to your users cuts round-trip time; edge locations push cacheable content even closer, without moving the origin.
Resilience
Spreading a workload across multiple AZs within a region means one data center failing (power, network, fire) doesn’t take the whole system down.
Data residency & compliance
Some regulations require customer data to stay within a specific country or region — the region you pick can be a compliance decision, not just a performance one.
Disaster recovery
Multi-region designs protect against a failure that takes out an entire region, not just a single zone — at the cost of more complexity and cross-region data sync.
Related
See region, availability zone, and edge location in the Glossary.