 Muckish is also the most northern and second highest of the mountain chain called the "Seven Sisters" by locals.The Seven Sisters are Muckish, Crocknalaragagh, Aghla Beg, Ardloughnabrackbaddy, Aghla More, Mackoght, and Errigal.High-grade quartz sand was mined on the flanks of the mountain; the remains of the quarry workings can be seen on its northern side.