OS sold 1.73 million paper maps in the 2017/18 financial year, up 7 per cent on the same period last year, with studies of Snowdon the most popular, followed by the south-east Lakes and the Peak ...

Scroll down for full descriptions and interactive guides to the best routes up Snowdon – and CLICK HERE to find out how you can get yourself 12 months of digital OS Maps for half price.

The British mapping agency Ordnance Survey has created a map of the Martian surface using precision NASA data — and it's beautiful.