Portnahaven
Information about the village of Portnahaven, from Wikipedia.
http://en.wikipedia.org/wiki/Portnahaven

The Armin Grewe Homepage
Photographs and brief description.
http://www.armin-grewe.com/islay/islay-portnahaven.htm

grid reference NR170521
The British national grid reference system is a system of geographic grid references commonly used in Great Britain, different from using latitude or longitude.
http://en.wikipedia.org/wiki/British_national_grid_reference_system