diff --git a/CHANGELOG.md b/CHANGELOG.md
index 603abd6d..f94aac05 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -217,6 +217,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 - **AWS/OpenSearch:** the STS account-ID lookup used for post-purchase tagging caches only a successful result, so one throttled or timed-out `GetCallerIdentity` no longer disables tagging for the client's lifetime (#53).
 - **AWS/recommendations:** `normalizeRegionName` maps the current `Europe (Ireland|Frankfurt|London|Paris|Stockholm)` Cost Explorer display names to region codes, so coverage lookups keyed by region code match those recommendations (#53).
+- **AWS/recommendations:** `normalizeRegionName` also maps `Asia Pacific (Malaysia|Thailand)`, `Canada West (Calgary)` and `Mexico (Central)` to `ap-southeast-5`, `ap-southeast-7`, `ca-west-1` and `mx-central-1` (#53).
 - **AWS/Savings Plans:** `GetExistingCommitments` returns an error naming the plan ID and value when a plan has an unparseable start or end date, instead of silently leaving the date zero (#53).
 - **AWS/Savings Plans:** `GetExistingCommitments` returns an error naming the plan ID when a plan has no start or end date; a zero start date was never treated as recent by the purchase dedupe, so a duplicate purchase could slip through (#53).
 - **AWS/RDS:** `PurchaseCommitment` refuses an offering whose upfront (`FixedPrice` x count) exceeds the approved recommendation upfront by more than 5%, or that is priced in a non-USD currency; a zero approved upfront is not checked (#53).
diff --git a/providers/aws/recommendations/converters.go b/providers/aws/recommendations/converters.go
index c451ad89..bce4fa59 100644
--- a/providers/aws/recommendations/converters.go
+++ b/providers/aws/recommendations/converters.go
@@ -132,6 +132,10 @@ func normalizeRegionName(region string) string {
 		"Europe (Zurich)":           "eu-central-2",
 		"Asia Pacific (Melbourne)":  "ap-southeast-4",
 		"Israel (Tel Aviv)":         "il-central-1",
+		"Asia Pacific (Malaysia)":   "ap-southeast-5",
+		"Asia Pacific (Thailand)":   "ap-southeast-7",
+		"Canada West (Calgary)":     "ca-west-1",
+		"Mexico (Central)":          "mx-central-1",
 	}
 
 	if normalized, ok := regionMap[region]; ok {
diff --git a/providers/aws/recommendations/converters_test.go b/providers/aws/recommendations/converters_test.go
index 47f458e3..6f6aa9ad 100644
--- a/providers/aws/recommendations/converters_test.go
+++ b/providers/aws/recommendations/converters_test.go
@@ -558,6 +558,10 @@ func TestNormalizeRegionName(t *testing.T) {
 		{name: "Europe (London)", region: "Europe (London)", expected: "eu-west-2"},
 		{name: "Europe (Paris)", region: "Europe (Paris)", expected: "eu-west-3"},
 		{name: "Europe (Stockholm)", region: "Europe (Stockholm)", expected: "eu-north-1"},
+		{name: "Asia Pacific (Malaysia)", region: "Asia Pacific (Malaysia)", expected: "ap-southeast-5"},
+		{name: "Asia Pacific (Thailand)", region: "Asia Pacific (Thailand)", expected: "ap-southeast-7"},
+		{name: "Canada West (Calgary)", region: "Canada West (Calgary)", expected: "ca-west-1"},
+		{name: "Mexico (Central)", region: "Mexico (Central)", expected: "mx-central-1"},
 		{
 			name:     "Unknown region returns as-is",
 			region:   "Unknown Region",
@@ -572,3 +576,27 @@ func TestNormalizeRegionName(t *testing.T) {
 		})
 	}
 }
+
+// TestNormalizeRegionName_NoCollisions pins that distinct display names map to
+// distinct region codes, so a new alias cannot silently shadow another region.
+func TestNormalizeRegionName_NoCollisions(t *testing.T) {
+	t.Parallel()
+	byCode := map[string]string{}
+	for name, code := range map[string]string{
+		"Asia Pacific (Malaysia)":  "ap-southeast-5",
+		"Asia Pacific (Thailand)":  "ap-southeast-7",
+		"Canada West (Calgary)":    "ca-west-1",
+		"Mexico (Central)":         "mx-central-1",
+		"Canada (Central)":         "ca-central-1",
+		"Asia Pacific (Jakarta)":   "ap-southeast-3",
+		"Asia Pacific (Singapore)": "ap-southeast-1",
+		"Asia Pacific (Sydney)":    "ap-southeast-2",
+		"Asia Pacific (Melbourne)": "ap-southeast-4",
+	} {
+		got := normalizeRegionName(name)
+		assert.Equal(t, code, got, name)
+		prev, dup := byCode[got]
+		assert.False(t, dup, "%q and %q both map to %q", prev, name, got)
+		byCode[got] = name
+	}
+}