The Outlands

The Outlands is the plane of true neutrality, lying at the hub of the Wheel and bordering every outer plane. Towns near its rim take on the nature of the plane next door, and gates there lead onward. At its centre an endless spire rises, and above it floats Sigil, the City of Doors. The nearer one travels to the spire, the weaker magic grows, until even the gods' power fails.

Reaching it. By a leather brown colour pool in The Astral Sea, a brown curtain in the Deep Ethereal or a plane shift fork of platinum tuned to C.