Is there any synonym for "abyss" with a non-negative connotation?

Could somebody tell me, what is the positive of the word "Abyss" ? As I know, abyss means an infinite depth or abode of evils, Hell. So isn't there any word which will mean the same as infinite depth or void but without pointing towards the negativity of Hell ?

The context in which I want to use this word is related to human emotion. I want to personify this word. I want a word with a meaning parallel to that of abyss but it should not have a negative connotation. You can say that I want to show the void or depth of a person but in one word to do all this.

Solution 1:

Yes: abyss, as in "abyssal depths" of the ocean. That's neutral and simply means "very very deep".

The infinite negativity of Hell is the Abyss with a capital A and (generally) the definite article.

Solution 2:

A comment from OP suggests he's looking for a neutral/positive word to describe metaphoric "depth" as applied to a person, in which context I suggest the person is perhaps...

profound - having intellectual depth and insight; characterized by intensity of feeling or quality.

The opposite is often expressed as shallow - lacking depth of intellect, emotion, or knowledge.

It's a little archaic/formal, but you can also say that someone "lacks bottom" (meaning they lack roots, grounding, or principles, rather than lacking gravitas/profundity). I've rarely if ever seen the non-negated form (it's invariably he lacks bottom, not he has bottom).