Carrowmore (Irish: An Cheathrú Mhór, 'the great quarter') is a large group of megalithic monuments on the Cúil Irra peninsula near Sligo, Ireland. They were built in the 4th millennium BCE, during the Neolithic era. There are thirty surviving tombs, placing Carrowmore among the largest and oldest complexes of megalithic tombs in Ireland. It is considered one of the 'big four' along with Carrowkeel, Loughcrew and Brú na Bóinne. Carrowmore is the heart of an ancient ritual landscape which is dominated by the mountain of Knocknarea to the west. It is a protected National Monument.