single-region

Type: decision

Decision

All landing zones deploy to a single region — the platform guarantees service parity by eliminating regional variation.

Why

Without that constraint, every deployment would carry its own region decision, and service parity would depend on each engineer's choice rather than being a platform guarantee.

Links

• config-lives-in-the-repo — The region is defined once in githubVariables.json — all deployments read it from there.
• landing-zone-github-runners — GitHub runner VNet integration is region-gated, so the platform's chosen region must support it.

← Back to all decisions