map hierarchy with latitude and longitude + region

Hi guys,

Can't solve this. What I want to create is a hierarchy with the region and then with som points (latitude + longitude) the problem is that I supose I need to create a field with the latitude+longitude, and then set a Category type, (but witch one?) and how  should the latitude and longitude be? e.g 40.47,-3.69??

Hope I explain my self, thanks