Black Mixen
 Black Mixen (Welsh: Micsen Du) is a subsidiary summit of Rhos Fawr or Great Rhos in the Radnor Forest. The summit is large peat bog plateau. The summit is marked with a cairn and is next to a radio transmitter and its building.Black Mixen is the only Nuttall to have a communications mast (a radio transmitter) on its summit . To the east is Bache Hill to the south are the Black Mountains to the west is the Great Rhos plateau.