HomeUSASouth DakotaNeedles Of Rushmore, TheHorsethief Lake AreaChessmen, TheMernMernLAT,LNG 43.88305, -103.49947CREATED UPDATED Edit MapShareDescription[Edit]Mern is the spire located just below (North) of North Needle and Guilt Edge, sitting about 50 feet southwest of Liederkranz and 50 feet north of Limp Richard on the ridge. Watertower is also in the area. Mern is named after a cross of moss and fern.1 ClimbsComing soon: New Climbs1Death Flake Arete5.8+Trad