Fastnet Rock (Irish: An Charraig Aonair, meaning Rock of Solitude or Lonesome Rock) is a small clay-slate island with quartz veins and the most southerly point of Ireland, 6.5 km southwest of Cape Clear Island (Oileán Chléire) in County Cork, which is itself 13 km (8 miles) from the mainland. It lies in the Atlantic Ocean 11.3 km south of mainland County Cork, at latitude 51.37°N. It rises to about 30 m above low water mark. Study of the documentary record suggests that the name is from Old Norse Hvastann-ey 'sharp tooth island'.
Divided into Fastnet Rock proper and the much smaller Little Fastnet to the south by a 10 m (30 ft) wide channel, it also had the nickname 'Ireland's Teardrop' as it was the last part of the country seen by Irish emigrants to the United States in the 19th century as they sailed past it.
Characteristics of the Fastnet Rock Lighthouse
51º 23.3’ North 9º 36.1’West
Fl W 5s White Flash every 5 seconds, also exhibited by day when the fog signal is sounding: nominal range 27 nautical miles.
Morse ‘G’ on vessel’s radar display.
4 blasts every 60 seconds
Height of Tower
Height of Light above mean high water springs
I write a logbook in this lighthouse,
Autumn waning, winter coming
Wind from the North
ships wave battered,
And every night
migrant birds calling.
The tower windows;
A time of change
That's my log.
D.J O'Sullivan (From Fastnet to Inishtrahull)