code: public void removeRegion(Region region) {
          if (regions.contains(region)) {
              if (serviceConnected) {
                  try {
                      beaconManager.stopMonitoringBeaconsInRegion(region);
                  } catch (RemoteException e) {
                      LogManager.e(e, TAG, "Can't stop bootstrap region");
                  }
              } else {
                  LogManager.w(TAG, "Removing a region: service not yet Connected");
              }
              regions.remove(region);
          }
      }
docs: Remove a given region
  
  @param region