Help, Please, What is the maximum possible size of the map ??

Hello, I want to make a map for a shooter game so seen from above, I want the map in landscape mode, the resolution of the window in landscape 4K but I would like the total map to be huge, I have to enter what as a number for the resolution and if it is possible to make a 20 000 x 10 000 map. Already is it possible to make a map of a very large scale? I am noob, I would like your opinion and your help for a map so big you will have to enter what as a resolution? Thank you in advance for your help.

The limits are set by game design, and target hardware. Figure those out first.

Otherwise, there are no real limits... when design, and hardware are taken into consideration.

Thank you very much for your advice, so it is possible to make a 20 000 x 10 000 map

Yes, when design, and hardware specifics are met.

A map can even be infinite.