FR XXXIII Part 2 Rōma, should this be Rōmae locative>

FR XXXIII Part 2 line 72
“Utinam hic amnis Tīberis esset et haec castra essent Rōma!”
Shouldn’t this be Rōmae locative? Would that ,and this camp were in Rome!
Gratias tibi ago. Jim

The sentence is grammatically correct. Tiberis and Roma are predicates in the nominative here – so, ‘would that this river were the Tiber and that this camp were Rome’.

I though “this camp were Rome” and thought, that doesn’t make sense-the camp isn’t Rome! It would have to be this camp were in Rome. Okay, this is a wish, so anything goes with a wish. “I wish this stink’n’ camp were Rome!” Thank you.