Are there any administrators here? How can I find out in which country the headquarters of this project is located? I can not find this information here.
You can take a look on the official project white papers which is available where you can view the complete information and the roadmap gives you a complete end to end vision with the infrastructure.
This I saw, and read completely the information on the road map. But I would like to know this information from an official source, for example, that would be answered by administrators, who unfortunately do not often write here.
The roadmap is official source to get information from, it's even 100% more accurate than the answer that you get from team members on telegram or as reply, because later if something goes wrong you can refer to roadmap and not for reply that get from chatting.