iPhone thinks I am in China

This is a user-to-user support forum. Apple's participation here is minimal.

Go to Settings>General>Language & Region>Region and, regardless of what it says the region is currently set to, reselect the correct region.

There is value in precision when asking technical support questions. ;-)

Is your problem with the Apple Maps app? Or a different one? Go to Settings>Location Services><App in question> and make sure Precise Location is enabled. See if that helps.

LD150 wrote:

Change region

start here Change your Apple ID country or region – Apple Support (UK)

That link explains how to change the region of your Apple ID account. It sounded to me as if the OP was saying the phone thinks it's in the wrong region. Will changing the account region help with that? (I've known weirder things to help!)

Change region

start here Change your Apple ID country or region – Apple Support (UK)

Best of luck! I'd also check to see if you have the same problem with Google Maps.

Good point. Maybe they should try yours first then mine.

LD150 wrote:

Good point. Maybe they should try yours first then mine.

Perhaps the OP will post back with more details. ;-)