Register WebAPI Routes with multiple nested segments

CountryController.cs

public class CountryController : ApiController {
    public IEnumerable<CountryResponseModel> Get() {
        // Logic
        return model;
    }

    public CountryResponseModel Get(int id) {
        // Logic
        return model;
    }

    public CountryResponseModel Post([FromBody] CountryRequestodel value) {
        // Logic
        return model;
    }

    public CountryResponseModel Put(int id, [FromBody] CountryRequestodel value) {
        // Logic
        return model;
    }

    public CountryResponseModel Delete(int id) {
        // Logic
        return model;
    }
}

CountyController.cs

public class CountyController : ApiController {
    public IEnumerable<CountyResponseModel> Get(int countryId, int stateId) {
        // Logic
        return model;
    }

    public CountyResponseModel Get(int countryId, int stateId, int id) {
        // Logic
        return model;
    }

    public CountyResponseModel Post(int countryId, int stateId, [FromBody] CountyRequestodel value) {
        // Logic
        return model;
    }

    public CountyResponseModel Put(int countryId, int stateId, int id, [FromBody] CountyRequestodel value) {
        // Logic
        return model;
    }

    public CountyResponseModel Delete(int countryId, int stateId, int id) {
        // Logic
        return model;
    }
}

StateController.cs

public class StateController : ApiController {
    public IEnumerable<StateResponseModel> Get(int countryId) {
        // Logic
        return model;
    }

    public StateResponseModel Get(int countryId, int id) {
        // Logic
        return model;
    }

    public StateResponseModel Post(int countryId, [FromBody] StateRequestodel value) {
        // Logic
        return model;
    }

    public StateResponseModel Put(int countryId, int id, [FromBody] StateRequestodel value) {
        // Logic
        return model;
    }

    public StateResponseModel Delete(int countryId, int id) {
        // Logic
        return model;
    }
}

WebApiRouteConfig.cs

public static class WebApiConfig {
    public static void Register(HttpConfiguration config) {
        RegisterRoutes(config.Routes);
    }

    public static void RegisterRoutes(HttpRouteCollection routes) {
	    routes.MapHttpRoute(name: "County_API",
	                        routeTemplate: "api/Countries/{countryId}/State/{stateId}/County/{id}",
	                        defaults:
	                            new {
	                                countryId = RouteParameter.Optional,
	                                stateId = RouteParameter.Optional,
	                                controller = "County",
	                                id = RouteParameter.Optional
	                            });
	    routes.MapHttpRoute(name: "State_API",
	                        routeTemplate: "api/Countries/{countryId}/State/{id}",
	                        defaults:
	                            new {
	                                countryId = RouteParameter.Optional,
	                                controller = "State",
	                                id = RouteParameter.Optional
	                            });

	    routes.MapHttpRoute(name: "Base_API",
	                        routeTemplate: "api/{controller}/{id}",
	                        defaults:
	                            new {
	                                controller = "Countries",
	                                id = RouteParameter.Optional
	                            });
	}
}