diff --git a/pkg/e2e/helpers.go b/pkg/e2e/helpers.go
index 86fa8d280f..526d53bd55 100644
--- a/pkg/e2e/helpers.go
+++ b/pkg/e2e/helpers.go
@@ -101,7 +101,9 @@ func WaitForIngress(s *Sandbox, ing *v1beta1.Ingress, options *WaitForIngressOpt
 		if err != nil {
 			return true, err
 		}
-		validator, err := fuzz.NewIngressValidator(s.ValidatorEnv, ing, features.All, []fuzz.WhiteboxTest{}, nil)
+		attrs := fuzz.DefaultAttributes()
+		attrs.Region = s.f.Region
+		validator, err := fuzz.NewIngressValidator(s.ValidatorEnv, ing, features.All, []fuzz.WhiteboxTest{}, attrs)
 		if err != nil {
 			return true, err
 		}
diff --git a/pkg/fuzz/features/neg.go b/pkg/fuzz/features/neg.go
index 94907d289f..13189e036a 100644
--- a/pkg/fuzz/features/neg.go
+++ b/pkg/fuzz/features/neg.go
@@ -57,8 +57,9 @@ func (*NegFeature) Name() string {
 type negValidator struct {
 	fuzz.NullValidator
 
-	ing *v1beta1.Ingress
-	env fuzz.ValidatorEnv
+	ing    *v1beta1.Ingress
+	env    fuzz.ValidatorEnv
+	region string
 }
 
 // Name implements fuzz.FeatureValidator.
@@ -71,6 +72,7 @@ func (v *negValidator) ConfigureAttributes(env fuzz.ValidatorEnv, ing *v1beta1.I
 	// Capture the env for use later in CheckResponse.
 	v.ing = ing
 	v.env = env
+	v.region = a.Region
 	return nil
 }
 
@@ -95,7 +97,7 @@ func (v *negValidator) CheckResponse(host, path string, resp *http.Response, bod
 	urlMapName := v.env.Namer().UrlMap(v.env.Namer().LoadBalancer(key))
 	if negEnabled {
 		if utils.IsGCEL7ILBIngress(v.ing) {
-			return fuzz.CheckResponseContinue, verifyNegRegionBackend(v.env, negName, negName, urlMapName)
+			return fuzz.CheckResponseContinue, verifyNegRegionBackend(v.env, negName, negName, urlMapName, v.region)
 		}
 		return fuzz.CheckResponseContinue, verifyNegBackend(v.env, negName, urlMapName)
 	} else {
@@ -186,10 +188,16 @@ func verifyBackend(env fuzz.ValidatorEnv, bsName string, backendKeyword string,
 }
 
 // verifyBackend verifies the backend service and check if the corresponding backend group has the keyword
-func verifyNegRegionBackend(env fuzz.ValidatorEnv, bsName string, backendKeyword string, urlMapName string) error {
+func verifyNegRegionBackend(env fuzz.ValidatorEnv, bsName, backendKeyword, urlMapName, region string) error {
 	klog.V(3).Info("Verifying NEG Regional Backend")
+
+	// Region can't be empty
+	if region == "" {
+		return fmt.Errorf("want region, got empty string")
+	}
+
 	ctx := context.Background()
-	beService, err := env.Cloud().AlphaRegionBackendServices().Get(ctx, &meta.Key{Name: bsName, Region: "us-central1"})
+	beService, err := env.Cloud().BetaRegionBackendServices().Get(ctx, &meta.Key{Name: bsName, Region: region})
 	if err != nil {
 		return err
 	}
@@ -205,7 +213,7 @@ func verifyNegRegionBackend(env fuzz.ValidatorEnv, bsName string, backendKeyword
 	}
 
 	// Examine if ingress url map is targeting the backend service
-	urlMap, err := env.Cloud().AlphaRegionUrlMaps().Get(ctx, &meta.Key{Name: urlMapName, Region: "us-central1"})
+	urlMap, err := env.Cloud().BetaRegionUrlMaps().Get(ctx, &meta.Key{Name: urlMapName, Region: region})
 	if err != nil {
 		return err
 	}
diff --git a/pkg/fuzz/validator.go b/pkg/fuzz/validator.go
index c11928db07..7f0c80211f 100644
--- a/pkg/fuzz/validator.go
+++ b/pkg/fuzz/validator.go
@@ -81,6 +81,7 @@ type IngressValidatorAttributes struct {
 	CheckHTTPS          bool
 	RejectInsecureCerts bool
 	RequestTimeout      time.Duration
+	Region              string
 	// HTTPPort and HTTPSPort are used only for unit testing.
 	HTTPPort  int
 	HTTPSPort int
@@ -154,8 +155,8 @@ type PathResult struct {
 	Err    error
 }
 
-// defaultAttributes are the base attributes for validation.
-func defaultAttributes() *IngressValidatorAttributes {
+// DefaultAttributes are the base attributes for validation.
+func DefaultAttributes() *IngressValidatorAttributes {
 	return &IngressValidatorAttributes{
 		CheckHTTP:      true,
 		CheckHTTPS:     false,
@@ -175,7 +176,7 @@ func NewIngressValidator(env ValidatorEnv, ing *v1beta1.Ingress, features []Feat
 	}
 
 	if attribs == nil {
-		attribs = defaultAttributes()
+		attribs = DefaultAttributes()
 	}
 	attribs.baseAttributes(ing)
 	if err := attribs.applyFeatures(env, ing, fvs); err != nil {
diff --git a/pkg/fuzz/validator_test.go b/pkg/fuzz/validator_test.go
index 6469cd321f..bf570f1563 100644
--- a/pkg/fuzz/validator_test.go
+++ b/pkg/fuzz/validator_test.go
@@ -306,7 +306,7 @@ func TestValidatorCheck(t *testing.T) {
 				ms.serve()
 			}
 
-			attribs := defaultAttributes()
+			attribs := DefaultAttributes()
 			attribs.HTTPPort = ms.l.Addr().(*net.TCPAddr).Port
 			attribs.HTTPSPort = ms.ls.Addr().(*net.TCPAddr).Port
 			validator, err := NewIngressValidator(&MockValidatorEnv{}, tc.ing, []Feature{}, []WhiteboxTest{}, attribs)
@@ -380,7 +380,7 @@ func TestValidatorCheckFeature(t *testing.T) {
 			}
 			ms.serve()
 
-			attribs := defaultAttributes()
+			attribs := DefaultAttributes()
 			attribs.HTTPPort = ms.l.Addr().(*net.TCPAddr).Port
 			attribs.HTTPSPort = ms.ls.Addr().(*net.TCPAddr).Port
 
@@ -412,13 +412,13 @@ func TestPortStr(t *testing.T) {
 		{
 			desc:   "http, default port",
 			scheme: "http",
-			a:      *defaultAttributes(),
+			a:      *DefaultAttributes(),
 			want:   "",
 		},
 		{
 			desc:   "https, default port",
 			scheme: "https",
-			a:      *defaultAttributes(),
+			a:      *DefaultAttributes(),
 			want:   "",
 		},
 		{