The "Exact" Distance has not been calculated and cannot be calculated based on current information. I can speculate based on what I understand about the theory, as well as earth science; roughly 320 miles up would be the peak, and would dwindle down to the ice wall at what is referred to as the edge. This is a stacked question as it is assuming that common believers in the flat earth theory have means to prove this. Unlike the globe model which has had a vast amount of resources to hide the truth within, it takes and resources to find valid scientific finding to prove our theory. ANy questions you have about the flat earth can be sent to me. IF you wish.