Look again and you see the ruins [in red] in on the lowest level of all the topography [in orange] on the entire map
or The Hobbit's (book's) map
To be fair we are talking about a movie thriology that already managed to necromance Azog, make the Goblins into albinos, the Istari drug addicts and give Galadriel the ability to teleport etc etc, so it's really a movie that is all for 'artistiv freedom', and that's OK, I have given up for a good book adaptation to come from this, but don't come and call it accurate haha.
@ leo
Nice!