I'm not a flat earther, but I'll answer so you can stop spamming this type of question.
Is flat earth one sided, whats on the other side.? Where is the math or pics of the outer limits of the earth must be quite extreme on the edges
Most flat earthers agree that we have no idea what is on the underside or edge of the earth. The edge hasn't been found, except possibly by someone who is a part of the "conspiracy".
The extreme cold of Antarctica makes it difficult, if not impossible, to explore far enough to find the edge. Anyone who has explored Antarctica either did not go far enough to detect the edge, or is part of the "conspiracy".
what cities are close to the edges , are there cities on the perimeters outer rim? Some cities on the outer rim must be truely fascinating id like to investigate these cities?
There is no concrete evidence to support any such city. Certainly no pictures. You
might find some theories about "Atlantis", or some other mythical lost continents beyond the "ice wall", but it is mostly just guessing or alternative interpretations of ancient texts.