What author are you talking about? You need to include it in your question.
Answer:
The top area
Explanation:
The bottom areas just show the wall itself. You could argue the 2nd highest is right at the edge of the wall meaning people will want to be here to get a small glance at the outside but the top makes more sense since it IS the other side
This quote justifies that if the population does not have the knowledge of basic politics and what the politicians are doing, they will vote for who they like instead of who who is doing right, which results in an incomplete democracy.