Out Stack is little more than a rocky outcrop, and is uninhabited. It has been described as "the full stop at the end of Britain".1 Travellers would not encounter any further land masses between Out Stack and the North Pole if heading directly north.
Jane Franklin, the wife of the Arctic explorer John Franklin, landed on Out Stack after John Rae's reports of the fate of the Franklin expedition had reached Stromness, Orkney, where she lived, in 1853/54.2
The Hermaness National Nature Reserve covers the Muckle Flugga rocks and Out Stack, as well as the seabird cliffs and moorland of Hermaness.
60°51′37″N 0°52′27″W / 60.8603°N 0.8741°W / 60.8603; -0.8741
"BBC Scotland - Grand Tours of the Scottish Islands, Series 3, Northern Exposure: The North Isles and Out Stack, the former home of Britain's most northerly lighthouse keepers". https://www.bbc.co.uk/programmes/p034ntk8 ↩
"Lady Jane Franklin, the Woman Who Fueled 19th-Century Polar Exploration". Atlas Obscura. 23 February 2017. Retrieved 17 September 2018. https://www.atlasobscura.com/articles/cool-lady-jane-franklin-polar-exploration ↩