diff --git a/integrations/amazon-security-lake/README.md b/integrations/amazon-security-lake/README.md
index 7af236b61b6bb..87c56b6cb7f6a 100644
--- a/integrations/amazon-security-lake/README.md
+++ b/integrations/amazon-security-lake/README.md
@@ -98,7 +98,7 @@ Follow the [official documentation](https://docs.aws.amazon.com/lambda/latest/dg
   | AWS_BUCKET           | True     | The name of the Amazon S3 bucket in which Security Lake stores your custom source data             |
   | SOURCE_LOCATION      | True     | The _Data source name_ of the _Custom Source_                                                      |
   | ACCOUNT_ID           | True     | Enter the ID that you specified when creating your Amazon Security Lake custom source              |
-  | AWS_REGION           | True     | AWS Region to which the data is written                                                            |
+  | REGION               | True     | AWS Region to which the data is written                                                            |
   | S3_BUCKET_OCSF       | False    | S3 bucket to which the mapped events are written                                                   |
   | OCSF_CLASS           | False    | The OCSF class to map the events into. Can be "SECURITY_FINDING" (default) or "DETECTION_FINDING". |
 
diff --git a/integrations/amazon-security-lake/src/lambda_function.py b/integrations/amazon-security-lake/src/lambda_function.py
index f8e140f2c84f3..0ee413f7f7656 100644
--- a/integrations/amazon-security-lake/src/lambda_function.py
+++ b/integrations/amazon-security-lake/src/lambda_function.py
@@ -14,7 +14,7 @@
         service_name='s3',
         aws_access_key_id=os.environ.get('AWS_ACCESS_KEY_ID'),
         aws_secret_access_key=os.environ.get('AWS_SECRET_ACCESS_KEY'),
-        region_name=os.environ.get('AWS_REGION'),
+        region_name=os.environ.get('REGION'),
         endpoint_url=os.environ.get('AWS_ENDPOINT'),
     )
 else:
@@ -124,8 +124,7 @@ def lambda_handler(event, context):
                         encoding='utf-8', level=logging.DEBUG)
 
     # Define required environment variables
-    required_variables = ['AWS_BUCKET',
-                          'SOURCE_LOCATION', 'ACCOUNT_ID', 'AWS_REGION']
+    required_variables = ['AWS_BUCKET', 'SOURCE_LOCATION', 'ACCOUNT_ID', 'REGION']
 
     # Check if all required environment variables are set
     if not check_environment_variables(required_variables):
@@ -135,7 +134,7 @@ def lambda_handler(event, context):
     dst_bucket = os.environ['AWS_BUCKET']
     src_location = os.environ['SOURCE_LOCATION']
     account_id = os.environ['ACCOUNT_ID']
-    region = os.environ['AWS_REGION']
+    region = os.environ['REGION']
     ocsf_bucket = os.environ.get('S3_BUCKET_OCSF')
     ocsf_class = os.environ.get('OCSF_CLASS', 'SECURITY_FINDING')