Possible bug or maybe Easter egg?

[Tree_d 0]

While playing the game, if you look into the sea map editor, or if you sail around the continents, you may find small areas of sea shaped like the continents near them. However, these are not classified as normal sea, but as lakes, so once you enter the area with a ship your army cannot leave. They are located north of the Continent in the case of Eurasia, or south of the continent with Australia, South America, and Africa. For North America, the strange continent-shaped sea is located southwest of Baffin Island. This bug can be annoying when you sail your army into it and you can't leave. However, it might be an Easter egg, but I doubt it.