Query GTM supplying Client IP address from LTM

Thanks AMG. I'm not concerned so much about the countries, it's my local users whom I wish to identify and send to their local DC. I have all the subnet definitions defining my local users locations already configured in my GTM config so was hoping I didn't have to duplicate.

Is there not a way to query the GTM datacentre topology definition from a LTM instance?

I guess I could define a bunch of different WIDEIP's one for each DC with a priority group and then duplicate the DC definitions into Datagroups on each LTM. It will be bit messy and a pain to administer however it would work. Was just hoping there was a more elegant method.

Thanks