(Survival Salt) Extract Salt from natural sorces (In the wild) without the Ocean
One option I know of is hickory salt, also found as hickory tree salt or hickory root salt.  (not to be confused with hickory smoked salts, which does require salt to make)

Hickory salt is made by digging up the roots of hickory trees, shredding them, and boiling them to a dry, black, salty and mineralish powder.  You may be able to get salt from hickory limbs, I saw a reference but only one, so no guarantees.

One recipe is here, another is there

Hickory seems the best bet (for me, anyway, for volume acquirable per plant, identifiability, local to my area etc) 

However, it seems there are some other plants that can yield salt - including a source citing coltsfoot, and (having heard of) wild parsnip or wild carrot roots, or stinging nettles, but that source has no experience with either.  

Lambs's quarters is another potential source - it's in the comments of the coltsfoot source, and mentioned here (as having mineral salts, not really "extracting them as salt source")

Another possibility is called saltbush, which is apparently used as a salty seasoning in australia.

Many of these sources are assuming a survival knowledge context, so these sources may be what you're looking for.

And of course it may be possible to find mineral salt deposits, from salty or brackish water or animal salt licks... this would involve observing larger animals (like deer, for example) to see where they're getting their salt from... it is essential for life for them as well.

It may, potentially, be possible to source salts from animal sources, since they must be sourcing salt somewhere, but I don't know anything about that or how to tell if any such preparation has it in sufficient quantities or whatever (vs perhaps other undesirable salts or mineral concentrations).  Sorry.