What's the difference between 其処ら, 至る所, and そこら中?


Trying to figure out how to say the word "everywhere" in Japanese, and I want
to make sure I'm using the correct one. Usually there's some difference due to
context or formality. Context of what I'm doing does not matter though,
because I'd generally like to hear when and where to use each word.




其処{そこ}ら is ambiguous between _anywhere/any ordinary place_ and _everywhere_.
So it overlaps with the other two mostly in the same way _anywhere_ and
_everywhere_ overlaps in English. For example, そこらでみられる literally means _can
be seen anywhere_ or just _common_ , which can be _can be seen everywhere_. It
is similar to そのへん (cf [this
question](https://japanese.stackexchange.com/q/91399/45489)). On the other
hand, そこらで買った means _bought around there_. Since buying happened at one place
and not everywhere obviously, it is different from そこら中で買った (which, being less
likely, means _bought things everywhere_ ).

至る所 and 其処ら中 means _everywhere/all over the place_ and are interchangeable as
far as I can think of. The latter is perhaps more colloquial due to the nature
of そこら.

