Azure Maps is a global load balanced service and not one you deploy to a specific region. Create the resource in any of the regions westcentralus, global, westus2, eastus, westeurope, northeurope
. Note that you aren't deploying a copy of Azure Maps into your subscription / specific area/region.
When someone uses your app and a request is made to Azure Maps, the request is routed to the nearest Azure endpoint to the user. So, you can set it up in eastus
but when you use it, the requests will flow through an Azure datacenter in Australia. But is someone in the UK uses your app, their request will likely flow through the Azure data center in Dublin Ireland.