diff --git a/google/devtools/testing/v1/test_environment_discovery.proto b/google/devtools/testing/v1/test_environment_discovery.proto
index cc4e88e7bb..937d271c98 100644
--- a/google/devtools/testing/v1/test_environment_discovery.proto
+++ b/google/devtools/testing/v1/test_environment_discovery.proto
@@ -321,6 +321,10 @@ message LabInfo {
   // Lab name where the device is hosted.
   // If empty, the device is hosted in a Google owned lab.
   string name = 1;
+
+  // The Unicode country/region code (CLDR) of the lab where the device is
+  // hosted. E.g. "US" for United States, "CH" for Switzerland.
+  string region_code = 2;
 }
 
 // The currently supported iOS devices.