around there; near there; that area
Refers vaguely to a place near the listener, near something just mentioned, or in the general area being pointed out.
I think you can buy it for around 5000 yen or so.
I think I put the key somewhere around there.
Is there a convenience store around there?
or thereabouts; or so; around that much
Used after a number, time, amount, or option to give an approximate point or range rather than an exact value.
I think I’ll arrive around three in the afternoon or so.
The cost will probably be about ten thousand yen or thereabouts.
that matter; that sort of thing; those details
Refers vaguely to a topic, issue, circumstances, or details just mentioned, rather than to a physical place.
I’ll explain that matter in detail later.
I don’t know the circumstances around that.
Just put the luggage down around there.
I don't really understand the details of that matter.
そこら辺 is a more colloquial, vaguer way of saying その辺, used in casual speech for both places and approximate amounts.
その辺 and そこら both mean 'around there', but その辺 is the more common expression in everyday modern speech.
この辺 points to an area near the speaker, while その辺 points to an area near the listener or already mentioned in conversation.
Standard mixed kana-kanji spelling and the prioritized form.
Attested full-kanji-style spelling; uncommon in modern everyday writing.
Transparent combination of その, “that,” and 辺, “area; vicinity; neighborhood.” The spelling 其の辺 writes その with kanji but is uncommon in ordinary modern writing.