Region is the first decision you make on a cloud platform and the hardest one to reverse. It is also routinely confused with IP location, which is a related but genuinely different thing. Getting the distinction straight prevents a specific class of expensive mistake.
Region, zone, edge
A region is a geographic area containing one or more physically separate data centres — Frankfurt, N. Virginia, Mumbai, Singapore. It is the unit you choose when you create a resource, and for most resources it is fixed for the life of that resource.
An availability zone is one or more of the data centres inside a region, isolated from the others for power, cooling and networking, but connected to them by low-latency links. Zones are how you survive a single facility failing. Running everything in one zone is the most common avoidable single point of failure in cloud architecture.
An edge location is neither. It is a CDN point of presence that caches content close to users. There are far more of them than there are regions, and they change the experience of static content without changing where your application runs.
What region choice actually decides
Latency
Light in fibre covers roughly 200 km per millisecond, and a request needs a round trip. London to Frankfurt is single-digit milliseconds; London to Sydney is around 250 ms before your application does any work at all. For a page that makes several sequential calls, that difference is the whole user experience.
Put the compute near the users. If the users are in two places, that is an architecture question — usually a CDN in front and a single region behind, because multi-region write paths are considerably harder than they look.
Legal exposure
Data residency rules attach to where data is stored and processed. If you handle EU personal data, or operate under a sector rule that names a jurisdiction, the region is not a preference. This is the entire proposition of European providers such as OVHcloud and Hetzner, and it is why “cheapest region” is sometimes not an available answer.
Available services
Not every service is in every region. New services launch in a handful of large regions first and take months or years to spread. Before committing to a region on any of the large platforms, check that the specific services you need are actually offered there.
Price
The same instance costs different amounts in different regions — sometimes 20-40 % apart. It is a real factor, and it is the last one to weigh, after latency and compliance have narrowed the field.
IP location is a separate axis
The region says where the machines are. The IP address’s geolocation is what third-party services see when your traffic reaches them, and the two do not always agree: geolocation databases lag reassignments, and providers move address blocks between regions.
This matters when something outside your control makes decisions based on your IP: a payment processor’s risk scoring, a partner API’s access rules, a rate limiter, a content licence. If a service you depend on cares where you appear to be, the IP location is a hard requirement in its own right, independent of latency.
That is why configurations in the catalog state IP location separately from region where the two differ. An account can be in one region and present addresses geolocated elsewhere; if that distinction matters to you, it is on the product page rather than something to find out afterwards.
A practical order of operations
- List any hard legal constraints on where data may live. These eliminate options and nothing overrides them.
- Locate your users, and pick the closest surviving region.
- Confirm the services you need exist in that region.
- Check whether anything downstream cares about your IP geolocation.
- Compare price across whatever is still standing.
- Spread across at least two availability zones inside the region you chose.
Region is one of the few cloud decisions that is genuinely painful to change later — moving data between regions costs both transfer fees and downtime. Ten minutes on this order of operations is cheap insurance.