Hello! (if someone is here)

I am using marble within my own Qt application to show technical objects on the map. I am using the 15.08 release of marble, Qt 4.8.6, OpenSuse 13.2.
I have some placemarks on the map. Can I define that placemark's coordinates relate to the continent or to the ocean? As I understand, continents and oceans are point placemarks, so there aren't any functions like "contains(GeoDataCoordinates)" to do what I want. I saw the example "marble-game" in the marble github and tried to use boundaries of the countries, but it did not work out.

Thanks in advance for your help.