Group devices by geographic location

Group devices by geographic location

Hi there,
 
I'd like to be able to list my devices (irrespective of whether they're routers, switches, firewalls or servers) by geographic location. for example, I'd like to be able to list all devices in London, or Sweden. How would I do this? If I edit the device, I see that I can add a City or building name, but how do I then use this device propery to create that list or group?
 
Thanks
 
Olly

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