That's the 1360 Gough Map (also called The Bodleian Map). It is the oldest surviving road map of Great Britain:
The map is the so-called 'Gough map', dating from roughly 1360, but likely copied from an earlier map created around 1280, during the reign of Edward I. It's the earliest surviving map that shows Britain in a recognisable shape – even if Scotland's priapic appearance might provoke giggles.
Previous maps had been largely rubbish, favouring theology over geography – they would show how Britain fitted into the wider world of Christendom, but would forget to make the island even roughly the right shape.