The correct answer to this open question is the following.
Unfortunately, you forgot to attach the map to see what is its content. Without the map, only you know what is there. We don't.
However, trying to help you, we did some deep research and can comment on the following.
We found a map of Europe from Napoleon's times. And from what we see on the map, we can say that it is the letter "A," which is the region of Great Britain.
So according to the map, it was Great Britain the country Napoleon was never able to invade. That is why he attempted to blockade with his Continental System.
Napoleon was furious and frustrated he could never invade the British Island, so he decided to impose a blockade with his continental system to paralyze England prohibiting any trade. He signed the Decree of Berlin and the Decree of Milan in 1806 and 1807 respectively, forcing his allies to stop trading with Great Britain.
