Next time you're striding across a wide expanse of nothing-ness in a seldom-visited corner of our isles, how about whipping out your camera and contributing to a fascinating project?

Geograph aims to cover every square kilometre of the Ordnance Survey national grid and produce a photographic record of our varied landscape.

So far, more than 114 000 grid squares have been covered by 2 300 participants. Chances are, there's an unrecorded square somewhere near you.

The online, not-for-profit company awards one point for the first picture of a geographical feature in each square. Top of the shop so far is Richard Webb with an impressive 4 930 points. He's submitted more than 7 000 pictures to the site.

Contributors have to agree to their pictures being used commercially to help support the cost of running the site, though they do keep copyright. Ordnance Survey has agreed a two-year sponsorship of the project, which was set up in April 2005 by Gary Rogers.

One nifty section allows you to select squares of the OS map and zoom in to see which squares still need photographs. Check out the site and get snapping.