Land's End to John O' Groats is a journey - the traversal of the whole of the island of Great Britain from South-West to North-East.

  - Land's End is the extreme Southwestward (but not Southern or Western) point of Great Britain, situated in western Cornwall at the end of the Penwith Peninsula.

- John O' Groats is the traditionally acknowledged extreme Northern point of Scotland, in Northeastern Caithness. The actual northernmost point is at nearby Dunnet Head. The point which is actually furthest by road from Land's End is Duncansby Head, about 2 miles (3.2 km) from John O' Groats.

The straight-line distance from Land's End to John O'Groats, is approximately 603 miles (970 km); it passes just east of Glasgow, leaves the Scottish coast near the Isle of Whithorn, crosses the sea and passes across the Isle of Man, passes a few miles to seaward of Holyhead on Anglesey, crosses the St David's peninsula of Pembrokeshire, and makes landfall again near St Just in Cornwall.

The distance by road is 874 miles (1,407 km), according to the much-photographed signposts at each end.

Expeditions from Land's End to John O' Groats (sometimes referred to as end-to-end or LE-JOG) have been undertaken using numerous forms of transport, and are often sponsored as charity fundraisers.

from Wikipedia