[Metatron]

From what I understand two terms you use would be inaccurate. First of all it's not an area, as it has no physical dimensions. Second of all it could not be called 'eternity' as it is composed of nothing and therefore no change to it is occurring, and change is the fundamental principle behind time.

Everything that exists, exists within the universe, there is nothing 'outside', there is no 'outside'. At least under the classical understanding, or theory, of existence. Some multiverse models posit that there may be other universes that we may one day expand into. Others yet posit that these other 'bubbles' might have differing laws of physics to us, and could destroy us on contact. Fun.