<Table> <Tr> <Td> (Full screen) </Td> </Tr> </Table> <Tr> <Td> (Full screen) </Td> </Tr> <P> Land's End to John o' Groats is the traversal of the whole length of the island of Great Britain between two extremities, in the southwest and northeast . The traditional distance by road is 874 miles (1,407 km) and takes most cyclists 10 to 14 days; the record for running the route is nine days . Off - road walkers typically walk about 1,200 miles (1,900 km) and take two or three months for the expedition . Two much - photographed signposts indicate the traditional distance at each end . </P> <Ul> <Li> Land's End is the traditionally acknowledged extreme southern point of mainland England . It is in western Cornwall at the end of the Penwith peninsula . The O.S. Grid Reference of the road end is SW342250, Post Code TR19 7AA . In fact it, or strictly speaking Dr Syntax's Head, SW341253, a few hundred yards NW of the road end, is mainland England's most westerly point . The most southerly point is Lizard Point, about 9 miles (14 km) further south . Land's End is sometimes reckoned incorrectly as mainland England's most southwesterly point . This accolade belongs to Gwennap Head, SW365215, which is at least 2 miles (3.2 km) further south than Dr Syntax's Head but only about 1.5 miles (2.4 km) less west . </Li> <Li> John o' Groats is the traditionally acknowledged extreme northern point of mainland Scotland, in northeastern Caithness, O.S. Grid Reference ND380735, Post Code KW1 4YR . The actual northernmost point is Dunnet Head about 2 miles (3 km) further north . The point that is farthest by road from Land's End is Duncansby Head, about 2 miles (3 km) east of John o' Groats . Duncansby Head is also the most northeasterly point of the Scottish mainland . </Li> </Ul>

How many miles is the length of britain