Carrowkeel is a Neolithic passage tomb cemetery in the south of County Sligo, near Boyle, County Roscommon. An Cheathrú Chaol in Irish means 'the Narrow Quarter'. Circumstantial Carbon 14 dating places the tombs at between 5400 and 5100 years old (3400 to 3100 BC), so that they predate the Pyramids on Egypt's Giza plateau by 500–800 years. Carrowkeel is one of the "big four" passage tomb cemeteries in Ireland (the other three are Brú na Bóinne, Lough Crew, and Carrowmore). Carrowkeel is set on high ground above Lough Arrow, and the tombs seem to be oriented towards the area of Cuil Irra, Knocknarea and Carrowmore. There are fourteen passage tombs in Carrowkeel. Some can be entered by crawling through a narrow passage. Twelve more passage tombs are located close by, most of which form part of the Keshcorran complex.