I am developing an application on wp8 / wp7 which will show a map with countries filled with different colors based on some data. For example it will show population density of the world.

For this to work I would be needing geo-coordinate information of all country boundaries, so that I can map that to screen coordinates and overlay polygons on top of the map. Is there any API to get such information in Bing maps or Nokia maps? I am specifically interested in Nokia maps.