The article introduces a new high-resolution administrative country boundaries tileset available for free to designers and developers using the latest version of Mapbox Studio. It explains the process of using this tileset to highlight individual countries through a masking technique, which involves hiding certain map features to emphasize specific geographic areas of interest while reducing visual clutter. Detailed steps are provided for styling the “Mapbox Countries V1” layer by adjusting opacity and colors, with an example focusing on the United States. The article also suggests adding geographical context by duplicating layers and styling them as lines, as well as incorporating a black and white satellite layer for background context. Finally, it encourages designers to share their creations on Twitter with the hashtag #BuiltWithMapbox.