It's not an infinite terrain. As explained by Dr Rowbotham, the ice wall encircles the earth and extends for hundreds of miles where hurricanes rage, temperatures plummet to inhospitable levels, and light is eventually lost to perpetual darkness.
Dr Rowbotham was also able to explain that earth floats on the waters of the great deep. Certainly, I would direct you to read Dr Rowbothams work, Earth not a globe, if you haven't already.