At the height of the Roman Empire how far north did the empire stretch?

Britannia

Explanation:

The Roman Empire reached its peak in about 117 AD, when the Emperor Trajan was ruling. At the empire's height, it was a huge and vast empire. There was more than five million square miles in the empire. It stretched all the way from Britannia, or roughly modern day Scotland or England in the north, into Africa in the south. The empire extended across most of Europe and into Asia.

mapmaking. cartography had been an art form for many years, but it wasn’t until the renaissance when ptolemy’s ancient system of latitude and longitude was rediscovered that mapmakers were able to make surprisingly accurate and useful maps.