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Benbulbin, sometimes spelled Ben Bulben or Benbulben (from the Irish: Binn Ghulbain), is a large flat-topped rock formation in County Sligo, Ireland. It is part of the Dartry Mountains, in an area sometimes called "Yeats Country".Benbulbin is a protected site, designated as a County Geological Site by Sligo County Council.

"Ben Bulben", "Benbulben", and "Benbulbin" are all anglicisations of the Irish name "Binn Ghulbain". "Binn" means "peak" or "mountain", while "Ghulbain" may mean beak or jaw, or may refer to Conall Gulban, a son of Niall of the Nine Hostages who was associated with the mountain.
Benbulbin was shaped during the ice age, when Ireland was under glaciers. Originally it was a large plateau. Glaciers moving from the northeast to southwest shaped it into its present distinct formation.

Benbulbin, and the Dartry Mountains as a whole, are composed of limestones on top of mudstones. These rocks formed in the area approximately 320 million years ago in a shallow sea. Uppermost in the limestone layer is a thicker, harder limestone called the Dartry Limestone Formation. Below this is a thinner transitional limestone formation – the Glencar Limestone Formation. Further down, the lower slopes consist of shaly mudstone known as the Benbulben Shale Formation. Scree deposits are found near the base.

Fossils exist throughout the layers of the mountains. All layers have many fossilised sea shells. The shale layer also holds some corals. Baryte was mined at Glencarbury near Benbulbin in the Dartry range between 1894 and 1979. Benbulbin is an established walking destination. If climbed by the north face, it is a hazardous climb. That side bears the brunt of the high winds and storms that come in from the Atlantic Ocean. However, if approached by the south side, it is an easy walk, since that side slopes very gently. From the summit there are views over the coastal plain of north County Sligo and the Atlantic ocean. The land adjacent to the western edge of the ridge is privately owned farmland and not accessible to the general public. However, there is a paved path up the south face to the east near Glencar Waterfall just over the County Leitrim border.

One of the trails running alongside Benbulbin mountain is the Gortarowey looped walk. It runs both through the forest and out in the open overlooking Benbulbin and the bay of Donegal. It is 5.5 kilometres (3 mi) in length and takes approximately 1.5 hours to walk.

Benbulbin hosts a variety of plants, including some organisms found nowhere else in Ireland. Many are Arctic–alpine plants, due to the mountain's height, which allows for cooler temperatures than is normal. These plants were established after the glaciers that created Benbulbin melted. Wild hares and foxes inhabit Benbulbin.

In 2012, research revealed that the fringed sandwort had survived the Ice Age and is perhaps 100,000 years old. In Ireland the plant is unique to Benbulbin. The discovery calls into question the prior consensus that Ireland's flora and fauna date from or after the end of the Ice Age.

Benbulbin is the setting of several Irish legends. It is said to be one of the hunting grounds of the Fianna, a band of warriors who are said to have lived in the 3rd century. One example is the story of The Pursuit of Diarmuid and Gráinne, in which the warrior Diarmuid Ua Duibhne (Diarmuid) is tricked by the giant Fionn mac Cumhaill (Finn McCool) into fighting an enchanted boar, which later kills the warrior by piercing his heart with its tusk. McCool is also said to have found his long-lost son Oisín at this location. The mountain is said to be Diarmuid and Gráinne's resting place. Also, in the 6th century, St. Columba fought a battle on the plain below Benbulbin at Cúl Dreimhne (Cooladrumman) for the right to copy a Psalter he had borrowed from St. Finnian.

On 20 September 1922, during the Irish Civil War, an Irish Republican Army column, including an armoured car were cornered in Sligo. The car was destroyed by another armoured car belonging to the Irish Free State's National Army, and six of the IRA soldiers fled up the Benbulbin's slopes. In the end, all were killed, allegedly after they had surrendered. They are known as the "Noble Six".

Brigadier Seamus Devins TD, Div. Adj. Brian MacNeill, Capt. Harry Benson, Lieut. Paddy Carroll, Vols. Tommy Langan and Joe Banks were those killed on the mountain. The six anti-treaty fighters were hunted down on the slopes of Benbulbin and put to death by Free State forces which were out to avenge the killing of Brigadier Joseph Ring eight days earlier. Two of those killed and Ring were ancestors of current and recent politicians: Ring is the grand uncle of Michael Ring, McNeill is the uncle of former Tánaiste and Minister for Justice, Equality and Law Reform Michael McDowell and Devins is the grandfather of Jimmy Devins. Mary O'Rourke once narrated a radio documentary telling how her grandmother's home was used as a safehouse.