The wall is a great wall which goes beyond the eye sight of any being. It is by far the biggest wall many have lay witness to. No matter how high one may go, they would never see the end of it. It goes on seemingly forever, far above the clouds. Only the wind itself could possibly see the top.
Behind the scenesEdit
The developers have stated that it lies at top of/or is the top of the Sacred Mountain (this may be including the island as part of the mountain).
Alexander saw and described the top of the Sacred Mountain when he was carried up to the Oracle in KQ6. The Sacred Mountain (actually lies just behind the city and includes the peak and caldera containing the Oracle Cave) is actually the highest point on the island, and stands above all other points on the island. It rises out of the plateau of the island.