So was gonna make another world for testing redstone creations today, and created a superflat world so i wouldn't have everything in my way. Well little did I know, I spawned in front of this massive wall. Curious, i flew to the top and found what looked like a normal minecraft world (non-superflat). It was only 13 blocks wide, but the length seems to go one forever.

Anyone encountered this before?

Settings were:

Gamemode: Creative
Seed:
Generate structures: Off
Cheats: On
World type: Superflat