Move your mouse around within the border to reveal a country shape. Identify the country shape and type it as an answer. Be warned, sections of the country shape will fade away when your mouse is not hovering over them. Select a new answer box to skip to the next country shape.
Sorry, this may not work particularly well on a touchscreen.
Rare case where it would be better if clicking on the map did NOT zoom in. I don't know if that is something that could be turned off. Nominated, either way.