Which preposition to use with regio

in Occurrences 3%

" Truly might our countryman have exclaimed in the language, if not with the generous emotions of the Trojan hero, when he beheld the noble deeds of his countrymen pencilled in a strange land "Quis jam locus Quae regio in terris nostri non plena laboris?

of Occurrences 1%

The Signer Dominico Castello-Grande Tremamondo was a little Venetian noble, descended in a right line from Aeneas, with a palazzo on the Canale Regio of Venice, which he let for a coffee-house; and living in the pomp and pride of a magnifico on something more than the wages of an English groom.

Which preposition to use with  regio