Lugduff (, meaning black hollow) at , is the 154th-highest peak in Ireland on the Arderin scale, and the 186th-highest peak on the Vandeleur-Lynam scale. Lugduff is situated in the southern sector of the Wicklow Mountains range, and forms a broad horseshoe around the Upper Lake of the Glendalough valley with the mountains of Mullacor , Conavalla , the hydroelectric station at Turlough Hill , and Camaderry .