It is a simple floating island in the vast sea of emptiness. Located at the borders of known space in our Realm, it contains almost nothing.
The only thing that sits on The Island is a tree, worn away by countless eternities of resting on The Island. Its purpose is unknown, if it even has a purpose. This seemingly lifeless tree does not do anything, and just stays where it is.
The reason why this island is even here is ambiguous at best.