Hi and welcome to the Checkmk community!
I’m sure there are many different ways, but host groups would be one quick idea.
Perhaps you already have your hosts grouped in different setup folders according to their location. And/or you can use host tags to attach a “location” tag to each host. Then use the Assignment of hosts to host groups rule set to add hosts to their location host group.
There’s already a built-in view “Monitor > Overview > Host groups”, but it shouldn’t be too hard to customize existing views or build your own