Why are there outlying towns/cities on the walls in Shingeki no Kyoujin? For example, this here:



Why does it need to jut out of the walls instead of just being inside the walls to begin with?
It is explained in manga Chapter 2 afterwords.



You should realize, that walls are long. I mean, really long. And it is impossible even to watch over wall, not to mention protecting it. So such districts do exist, to attract all titans attention, since it is much easier to protect small district than miles of wall.