Make location from surface
 

In CFD Post, I want to find the area average of a variable at a surface that I didn't name beforehand. It's one of the mesh regions and so can be specified as a location, but there are so many regions in my complicated geometry that it would be tedious to click through a hundred of them to find which is the surface I want. Is there a way I can point to the surface in the 3D viewer and then turn that into a location or at least get the mesh region ID? Thanks.