Refers to a general area near the listener or a previously mentioned place. Casual and common in spoken Japanese.
Grab the book that's around there.
Let's take a walk around that area.
Used to refer vaguely to a topic, situation, or point in conversation. Often implies 'that kind of thing' or 'that part' without specifying exactly.
I still don't really understand that part.
That's the tricky part, isn't it.
about that much; approximately that amount; thereabouts; (or) so
Follows a quantity expression, often in the patterns ～かそこら or ～やそこら, to mean 'about that much' or 'or so'. Casual and colloquial.
We'll arrive in about ten minutes or so.
You can buy it for around 1000 yen.
It'll be done in ten minutes or so.
There are books scattered all over the room.