There isn't anything "where"? You are still using spacial/temporal base to talk about something that you cannot imagine using those things. A "pure nothing" can never be adumbrated with any kind of solidity. To even start using terms like "pure nothing" shows the fault with the idea.
You have a concept of nothing. It exists otherwise this entire topic would never exist.
What does not exist is simply beyond any possible sensibility. The term existence itself exists only as a faculty of our represention of reality as a causal whole.
