unable to access a child page by its node alias

To start, I'm unsure why you'd create container only pages if you plan to navigate to those pages later on. This doesn't make sense at all. What I'd suggest is creating 2 page types one for country and one for continent. Then, you'd create all your destinations in the content tree under /destinations. Like so:

/destinations/asia
/destinations/australia
/destinations/europe

Then under each continent, you'd add a country like so:

/destinations/asia/india
/destinations/asia/china
/destinations/asia/cambodia

In this example above, there is no need to create URL patterns.

If you plan to use data from elsewhere to dynamically create your page, you can then create URL patterns on the /destinations page like so:

/destinations/{Continent}
/destinations/{Continent}/{Country}

Then in your web parts on the /destinations page you can use querystrings to get the values like so in your where condition:

ContinentNameColumn = '{% QueryString.GetValue("Continent")|(default)novalue |(identity)GlobalAdministrator%}'

Thanks Brenden Kehren for your quick response, i'm using kentico12 mvc, for the seapration purpose i have created this container, for example countries of asia will be under asia container and countries of europe will be under europe container, if i change this container type to page type will this work?

Ok that makes more sense then. What I specified above is irrelivant to MVC, it would have worked with Portal without issue.

From an document query standpoint, you'd want to use NodeAliasPath which will hold the path in the content tree you have setup. Using URL patterns in the front end Kentico application won't help at all, you need to set these routes all up in your MVC app.

i have added route like this way

routes.MapRoute( name: "DestinationsCountry", url: "Destinations/{pageAlias}", defaults: new { controller = "Destinations", action = "DestinationCountry" } );