Locus in quo

Locus in quo means, in British common law, the "scene of the event", orThe phrase comes from the Latin language, meaning "The place in which". In law, locus in quo refers to the "the place where the cause of action arose", that is, the land to which the defendant trespassed. It may also be used, more generally, as any place mentioned, that is, the venue or place mentioned.
See more at Wikipedia.org...

The place in which
during proceedings may be used as reference to subject matter ie scene of accident

The place in which something happens