Finding the place magnetically hiddenYou can not observe it by your naked eyes, because even light has been bended in this magnetic area.
So,
We'll use the shooting technic to find it.
We'll use both a steel bullet and another bullet has non magnetic materials and steel together. We'll find both existance and borders of the area by using this test.
I gave the following drawing as an example, but the path of bullets may be different.
This methid depends on magnetic and non magnetic material's act different in a magnetic area.

In this drawing, we see a steel and half steel bullets how act in a magnetic and in an ordinary areas. As a result, bullet will fall to the expected area in all ecperiments, because the total forces act it equal to zero. But steel object additionally affected by magnetic area and its path is different than a half magnetic object.
If you do not understand the issue, so do not write anything here.