diff --git a/action.yml b/action.yml
index d158dc9..a3cbad2 100644
--- a/action.yml
+++ b/action.yml
@@ -1,6 +1,11 @@
 name: Build Task Definition from ECS Service
 description: Build a task-definition from merging a given container-definitions JSON file into the task-definition of a running service on ECS.
 inputs:
+  region:
+    description: | 
+      Region in which the ECS service log group is present
+      This will also replace <REGION> strings from you container-definitions file.
+    required: true
   cluster:
     description: | 
       Name of the cluster
diff --git a/dist/build-task-definition.sh b/dist/build-task-definition.sh
index 1b34b19..3b7c86a 100755
--- a/dist/build-task-definition.sh
+++ b/dist/build-task-definition.sh
@@ -37,7 +37,7 @@ pretty_print_task_definition() {
   echo "$task_definition"
 }
 
-container_definitions=$(sed -e "s+<IMAGE>+$INPUT_IMAGE+g;" -e "s+<CLUSTER>+$INPUT_CLUSTER+g;" "$INPUT_CONTAINER_DEFINITIONS_PATH")
+container_definitions=$(sed -e "s+<IMAGE>+$INPUT_IMAGE+g;" -e "s+<CLUSTER>+$INPUT_CLUSTER+g;" -e "s+<REGION>+$INPUT_REGION+g; "$INPUT_CONTAINER_DEFINITIONS_PATH")
 container_definitions=$(
   echo "$container_definitions" | \
   jq '. | map(if has("portMappings") then .portMappings |= map(if .hostPort == null then .hostPort = .containerPort else . end) else . end)'
diff --git a/src/build-task-definition.sh b/src/build-task-definition.sh
index 1b34b19..3b7c86a 100755
--- a/src/build-task-definition.sh
+++ b/src/build-task-definition.sh
@@ -37,7 +37,7 @@ pretty_print_task_definition() {
   echo "$task_definition"
 }
 
-container_definitions=$(sed -e "s+<IMAGE>+$INPUT_IMAGE+g;" -e "s+<CLUSTER>+$INPUT_CLUSTER+g;" "$INPUT_CONTAINER_DEFINITIONS_PATH")
+container_definitions=$(sed -e "s+<IMAGE>+$INPUT_IMAGE+g;" -e "s+<CLUSTER>+$INPUT_CLUSTER+g;" -e "s+<REGION>+$INPUT_REGION+g; "$INPUT_CONTAINER_DEFINITIONS_PATH")
 container_definitions=$(
   echo "$container_definitions" | \
   jq '. | map(if has("portMappings") then .portMappings |= map(if .hostPort == null then .hostPort = .containerPort else . end) else . end)'