Two Rock (Irish: Binn Dá Charraig; archaic: Black Mountain; Sliab Lecga (meaning Mountain of Flagstones)) is a mountain in Dún Laoghaire–Rathdown, Ireland. It is 536 metres (1,759 feet) high and is the 382nd highest mountain in Ireland. It is the highest point of the group of hills in the Dublin Mountains which comprises Two Rock, Three Rock, Kilmashogue and Tibradden Mountains. The mountain takes its name from the two granite tors that lie to the south-east of the summit.