diff --git a/packages/@aws-cdk/region-info/build-tools/aws-entities.ts b/packages/@aws-cdk/region-info/build-tools/aws-entities.ts
index 1588af66c6384..28c59828f7477 100644
--- a/packages/@aws-cdk/region-info/build-tools/aws-entities.ts
+++ b/packages/@aws-cdk/region-info/build-tools/aws-entities.ts
@@ -4,32 +4,33 @@
  * Not in the list ==> no built-in data for that region.
  */
 export const AWS_REGIONS = [
-  'us-east-2',
-  'us-east-1',
-  'us-west-1',
-  'us-west-2',
-  'us-gov-east-1',
-  'us-gov-west-1',
-  'us-iso-east-1',
-  'us-isob-east-1',
-  'af-south-1',
-  'ap-east-1',
-  'ap-south-1',
-  'ap-northeast-2',
-  'ap-southeast-1',
-  'ap-southeast-2',
-  'ap-northeast-1',
-  'ca-central-1',
-  'cn-north-1',
-  'cn-northwest-1',
-  'eu-central-1',
-  'eu-west-1',
-  'eu-west-2',
-  'eu-west-3',
-  'eu-north-1',
-  'eu-south-1',
-  'me-south-1',
-  'sa-east-1',
+  'af-south-1', // Africa (Cape Town)
+  'ap-east-1', // Asia Pacific (Hong Kong)
+  'ap-northeast-1', // Asia Pacific (Tokyo)
+  'ap-northeast-2', // Asia Pacific (Seoul)
+  'ap-northeast-3', // Asia Pacific (Osaka)
+  'ap-south-1', // Asia Pacific (Mumbai)
+  'ap-southeast-1', // Asia Pacific (Singapore)
+  'ap-southeast-2', // Asia Pacific (Sydney)
+  'ca-central-1', // Canada (Central)
+  'cn-north-1', // China (Beijing)
+  'cn-northwest-1', // China (Ningxia)
+  'eu-central-1', // Europe (Frankfurt)
+  'eu-north-1', // Europe (Stockholm)
+  'eu-south-1', // Europe (Milan)
+  'eu-west-1', // Europe (Ireland)
+  'eu-west-2', // Europe (London)
+  'eu-west-3', // Europe (Paris)
+  'me-south-1', // Middle East (Bahrain)
+  'sa-east-1', // South America (São Paulo)
+  'us-east-1', // US East (N. Virginia)
+  'us-east-2', // US East (Ohio)
+  'us-gov-east-1', // AWS GovCloud (US-East)
+  'us-gov-west-1', // AWS GovCloud (US-West)
+  'us-iso-east-1', // AWS ISO
+  'us-isob-east-1', // AWS ISO-B
+  'us-west-1', // US West (N. California)
+  'us-west-2', // US West (Oregon)
 ].sort();
 
 /**
diff --git a/packages/@aws-cdk/region-info/build-tools/fact-tables.ts b/packages/@aws-cdk/region-info/build-tools/fact-tables.ts
index dc7f8ff586449..2f47e02f64da4 100644
--- a/packages/@aws-cdk/region-info/build-tools/fact-tables.ts
+++ b/packages/@aws-cdk/region-info/build-tools/fact-tables.ts
@@ -46,29 +46,29 @@ export const AWS_CDK_METADATA = new Set([
  * @see https://docs.aws.amazon.com/general/latest/gr/rande.html#s3_website_region_endpoints
  */
 export const ROUTE_53_BUCKET_WEBSITE_ZONE_IDS: { [region: string]: string } = {
-  'us-east-2': 'Z2O1EMRO9K5GLX',
-  'us-east-1': 'Z3AQBSTGFYJSTF',
-  'us-west-1': 'Z2F56UZL2M1ACD',
-  'us-west-2': 'Z3BJ6K6RIION7M',
-  'us-gov-east-1': 'Z2NIFVYYW2VKV1',
-  'us-gov-west-1': 'Z31GFT0UA1I2HV',
   'af-south-1': 'Z11KHD8FBVPUYU',
   'ap-east-1': 'ZNB98KWMFR0R6',
-  'ap-south-1': 'Z11RGJOFQNVJUP',
-  'ap-northeast-3': 'Z2YQB5RD63NC85',
+  'ap-northeast-1': 'Z2M4EHUR26P7ZW',
   'ap-northeast-2': 'Z3W03O7B5YMIYP',
+  'ap-northeast-3': 'Z2YQB5RD63NC85',
+  'ap-south-1': 'Z11RGJOFQNVJUP',
   'ap-southeast-1': 'Z3O0J2DXBE1FTB',
   'ap-southeast-2': 'Z1WCIGYICN2BYD',
-  'ap-northeast-1': 'Z2M4EHUR26P7ZW',
   'ca-central-1': 'Z1QDHH18159H29',
   'eu-central-1': 'Z21DNDUVLTQW6Q',
+  'eu-north-1': 'Z3BAZG2TWCNX0D',
+  'eu-south-1': 'Z3IXVV8C73GIO3',
   'eu-west-1': 'Z1BKCTXD74EZPE',
   'eu-west-2': 'Z3GKZC51ZF0DB4',
   'eu-west-3': 'Z3R1K369G5AVDG',
-  'eu-north-1': 'Z3BAZG2TWCNX0D',
-  'eu-south-1': 'Z3IXVV8C73GIO3',
-  'sa-east-1': 'Z7KQH4QJS55SO',
   'me-south-1': 'Z1MPMWCPA7YB62',
+  'sa-east-1': 'Z7KQH4QJS55SO',
+  'us-east-1': 'Z3AQBSTGFYJSTF',
+  'us-east-2': 'Z2O1EMRO9K5GLX',
+  'us-gov-east-1': 'Z2NIFVYYW2VKV1',
+  'us-gov-west-1': 'Z31GFT0UA1I2HV',
+  'us-west-1': 'Z2F56UZL2M1ACD',
+  'us-west-2': 'Z3BJ6K6RIION7M',
 };
 
 interface Region { partition: string, domainSuffix: string }
@@ -83,63 +83,64 @@ export const PARTITION_MAP: { [region: string]: Region } = {
 
 // https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-access-logs.html#access-logging-bucket-permissions
 export const ELBV2_ACCOUNTS: { [region: string]: string } = {
-  'us-east-1': '127311923021',
-  'us-east-2': '033677994240',
-  'us-west-1': '027434742980',
-  'us-west-2': '797873946194',
   'af-south-1': '098369216593',
-  'ca-central-1': '985666609251',
-  'eu-central-1': '054676820928',
-  'eu-west-1': '156460612806',
-  'eu-west-2': '652711504416',
-  'eu-west-3': '009996457667',
-  'eu-south-1': '635631232127',
-  'eu-north-1': '897822967062',
   'ap-east-1': '754344448648',
   'ap-northeast-1': '582318560864',
   'ap-northeast-2': '600734575887',
   'ap-northeast-3': '383597477331',
+  'ap-south-1': '718504428378',
   'ap-southeast-1': '114774131450',
   'ap-southeast-2': '783225319266',
-  'ap-south-1': '718504428378',
+  'ca-central-1': '985666609251',
+  'cn-north-1': '638102146993',
+  'cn-northwest-1': '037604701340',
+  'eu-central-1': '054676820928',
+  'eu-north-1': '897822967062',
+  'eu-south-1': '635631232127',
+  'eu-west-1': '156460612806',
+  'eu-west-2': '652711504416',
+  'eu-west-3': '009996457667',
   'me-south-1': '076674570225',
   'sa-east-1': '507241528517',
-  'us-gov-west-1': '048591011584',
+  'us-east-1': '127311923021',
+  'us-east-2': '033677994240',
   'us-gov-east-1': '190560391635',
-  'cn-north-1': '638102146993',
-  'cn-northwest-1': '037604701340',
+  'us-gov-west-1': '048591011584',
+  'us-west-1': '027434742980',
+  'us-west-2': '797873946194',
 };
 
 // https://aws.amazon.com/releasenotes/available-deep-learning-containers-images
 export const DLC_REPOSITORY_ACCOUNTS: { [region: string]: string } = {
-  'us-east-1': '763104351884',
-  'us-east-2': '763104351884',
-  'us-west-1': '763104351884',
-  'us-west-2': '763104351884',
-  'ca-central-1': '763104351884',
-  'eu-west-1': '763104351884',
-  'eu-west-2': '763104351884',
-  'eu-west-3': '763104351884',
-  'eu-central-1': '763104351884',
-  'eu-north-1': '763104351884',
-  'sa-east-1': '763104351884',
-  'ap-south-1': '763104351884',
+  'ap-east-1': '871362719292',
   'ap-northeast-1': '763104351884',
   'ap-northeast-2': '763104351884',
+  'ap-south-1': '763104351884',
   'ap-southeast-1': '763104351884',
   'ap-southeast-2': '763104351884',
-
-  'ap-east-1': '871362719292',
-  'me-south-1': '217643126080',
-
+  'ca-central-1': '763104351884',
   'cn-north-1': '727897471807',
   'cn-northwest-1': '727897471807',
+  'eu-central-1': '763104351884',
+  'eu-north-1': '763104351884',
+  'eu-west-1': '763104351884',
+  'eu-west-2': '763104351884',
+  'eu-west-3': '763104351884',
+  'me-south-1': '217643126080',
+  'sa-east-1': '763104351884',
+  'us-east-1': '763104351884',
+  'us-east-2': '763104351884',
+  'us-west-1': '763104351884',
+  'us-west-2': '763104351884',
 };
 
 // https://docs.aws.amazon.com/app-mesh/latest/userguide/envoy.html
 export const APPMESH_ECR_ACCOUNTS: { [region: string]: string } = {
+  'af-south-1': '924023996002',
+  'ap-east-1': '856666278305',
   'ap-northeast-1': '840364872350',
   'ap-northeast-2': '840364872350',
+  'ap-northeast-3': '840364872350',
   'ap-south-1': '840364872350',
   'ap-southeast-1': '840364872350',
   'ap-southeast-2': '840364872350',
@@ -150,14 +151,10 @@ export const APPMESH_ECR_ACCOUNTS: { [region: string]: string } = {
   'eu-west-1': '840364872350',
   'eu-west-2': '840364872350',
   'eu-west-3': '840364872350',
+  'me-south-1': '772975370895',
   'sa-east-1': '840364872350',
   'us-east-1': '840364872350',
   'us-east-2': '840364872350',
   'us-west-1': '840364872350',
   'us-west-2': '840364872350',
-
-  'me-south-1': '772975370895',
-  'ap-east-1': '856666278305',
-  'af-south-1': '924023996002',
-
 };
diff --git a/packages/@aws-cdk/region-info/build-tools/generate-static-data.ts b/packages/@aws-cdk/region-info/build-tools/generate-static-data.ts
index 08a9f79a72b2b..d23704b6d0062 100644
--- a/packages/@aws-cdk/region-info/build-tools/generate-static-data.ts
+++ b/packages/@aws-cdk/region-info/build-tools/generate-static-data.ts
@@ -8,6 +8,11 @@ import {
 } from './fact-tables';
 
 async function main(): Promise<void> {
+  checkRegions(APPMESH_ECR_ACCOUNTS);
+  checkRegions(DLC_REPOSITORY_ACCOUNTS);
+  checkRegions(ELBV2_ACCOUNTS);
+  checkRegions(ROUTE_53_BUCKET_WEBSITE_ZONE_IDS);
+
   const lines = [
     "import { Fact, FactName } from './fact';",
     '',
@@ -76,6 +81,19 @@ async function main(): Promise<void> {
   }
 }
 
+/**
+ * Verifies that the provided map of region to fact does not contain an entry
+ * for a region that was not registered in `AWS_REGIONS`.
+ */
+function checkRegions(map: Record<string, unknown>) {
+  const allRegions = new Set(AWS_REGIONS);
+  for (const region of Object.keys(map)) {
+    if (!allRegions.has(region)) {
+      throw new Error(`Un-registered region fact found: ${region}. Add to AWS_REGIONS list!`);
+    }
+  }
+}
+
 main().catch(e => {
   // eslint-disable-next-line no-console
   console.error(e);
diff --git a/packages/@aws-cdk/region-info/test/__snapshots__/region-info.test.js.snap b/packages/@aws-cdk/region-info/test/__snapshots__/region-info.test.js.snap
index 55df3731f4eec..ab12430e57c84 100644
--- a/packages/@aws-cdk/region-info/test/__snapshots__/region-info.test.js.snap
+++ b/packages/@aws-cdk/region-info/test/__snapshots__/region-info.test.js.snap
@@ -82,6 +82,26 @@ Object {
     },
     "vpcEndPointServiceNamePrefix": "com.amazonaws.vpce",
   },
+  "ap-northeast-3": Object {
+    "cdkMetadataResourceAvailable": false,
+    "domainSuffix": "amazonaws.com",
+    "partition": "aws",
+    "s3StaticWebsiteEndpoint": "s3-website.ap-northeast-3.amazonaws.com",
+    "servicePrincipals": Object {
+      "application-autoscaling": "application-autoscaling.amazonaws.com",
+      "autoscaling": "autoscaling.amazonaws.com",
+      "codedeploy": "codedeploy.ap-northeast-3.amazonaws.com",
+      "ec2": "ec2.amazonaws.com",
+      "events": "events.amazonaws.com",
+      "lambda": "lambda.amazonaws.com",
+      "logs": "logs.ap-northeast-3.amazonaws.com",
+      "s3": "s3.amazonaws.com",
+      "sns": "sns.amazonaws.com",
+      "sqs": "sqs.amazonaws.com",
+      "states": "states.ap-northeast-3.amazonaws.com",
+    },
+    "vpcEndPointServiceNamePrefix": "com.amazonaws.vpce",
+  },
   "ap-south-1": Object {
     "cdkMetadataResourceAvailable": true,
     "domainSuffix": "amazonaws.com",