GeoGraph - photograph every grid square

Letterboxing

I won't tell you exactly where this is, but I caught these two in the act of letter boxing. A small container (the letterbox) containing a stamp and visitors' book is hidden on the moor, and a clue is written to lead others to its position. Clues may be as simple as a map reference and list of compass bearings, or may be more cryptic. When a letterbox is found, the letterboxer takes a copy of the stamp, as well as leaving their own personal print in the visitors' book. Letterboxing began on Dartmoor.