Separating sentences so you can follow easier.
Anything not involved in the riddle cannot be used in your answer, so no answers like ''a fairy put me there''.
HINT: use first person view in this riddle.



You are somewhere on earth.
You make 1000 steps south.
You make 500 steps to your east.
You make another 500 steps to the same direction.
Finally, you make 1000 steps to your east.
Somehow, you end up on the exact same location of where you started walking.
The riddle is, where are you?

The horse’s name was Friday

I am somewhere on earth

Is it a treadmill?

you're in quicksand

I'm in the exact same location of where I started walking, somewhere on earth ¿?