其処な is read as そこな (sokona) and means there.
そこな
sokona
そこかしこ
here and there
そこ
there (place relatively near listener)
それどころ
(not) so much
そこで
so
そこら
everywhere
そこここ
そこいら
that area
どこそこ
such-and-such a place
そのまま
just like
それほど
to that degree
それから
and then
どこ
how much (long, far)