1. DomName('Geofencing.registerRegion')
  2. DocsEditable()
  3. Experimental()
Future registerRegion(GeofencingRegion region)

Source 

@DomName('Geofencing.registerRegion')
@DocsEditable()
@Experimental() // untriaged
Future registerRegion(GeofencingRegion region) => wrap_jso(_blink.BlinkGeofencing.instance.registerRegion_Callback_1_(unwrap_jso(this), unwrap_jso(region)));