The map above, titled An Entirely New & Accurate Survey Of The County Of Kent, With Part Of The County Of Essex was created by William Mudge in 1801 and is regarded at the first official Ordnance Survey map.
The map above shows just how many people live in London. The blue area above has the same population as Scotland, 5.3 million people.
And the pink area contains the same population as Scotland, Wales and Northern Ireland combined, a little over 10 million people.
The map above was created by the Britain Stronger in Europe campaign and highlights the huge risk to the British economy if it votes to leave the EU.
At risk are EU signed free trade deals with 60+ countries (covering an area far larger than the British Empire). If the UK were to leave, it would have to start from square one and renegotiate new free trade deals with each and every one.