diff --git a/packages/aws-cdk-lib/region-info/build-tools/metadata.ts b/packages/aws-cdk-lib/region-info/build-tools/metadata.ts
index c97ef832bf8ad..eb74c7396da1d 100644
--- a/packages/aws-cdk-lib/region-info/build-tools/metadata.ts
+++ b/packages/aws-cdk-lib/region-info/build-tools/metadata.ts
@@ -12,6 +12,7 @@ export const AWS_CDK_METADATA = new Set([
   'ap-east-1',
   'ap-northeast-1',
   'ap-northeast-2',
+  'ap-northeast-3',
   'ap-south-1',
   'ap-southeast-1',
   'ap-southeast-2',