The controller is not picking up the route?

See more:

ASP.NET

routing

MVC6

I have the routes.

public static void RegisterRoutes(RouteCollection routes)
       {
           routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

           routes.MapRoute("SurveySubmitRoute", "Survey/Submit",
                           defaults: new {action = "Submit", controller = "Survey"});

           routes.MapRoute("SurveyWelcomeRoute", "Survey/{id}",
                           defaults: new { action = "Index", controller = "Survey" });
           routes.MapRoute("SurveyLanguageRoute","Survey/Language{languageName}",
               defaults: new { action = "Language", controller = "Survey" });


           routes.MapRoute(
               name: "Default",
               url: "{controller}/{action}/{id}",
               defaults: new { controller = "Account", action = "Login", id = UrlParameter.Optional }
           );
       }

In my view, I want to go to the Language method.

window.location.href = "/Survey/Language?languageName=" + selectedValue;

In the controller, we have

public ActionResult Index(Guid id){ // omitted details}

And

 public ActionResult Language(string languageName)
        {
// omitted the details
}

My question is the code doesn't go to Language method. It always goes to Index method.
Why?

What I have tried:

No clue so far. Thanks for help.