HomeUSASouth DakotaCuster State ParkGrace BasinAquarium, TheMerman BoulderMerman BoulderLAT,LNG 43.79339, -103.36046CREATED UPDATED Edit MapShareDescription[Edit]This boulder is directly behind The Fish boulder. It has two known warm up problems on it and is worth checking out if you are in the vicinity.2 ClimbsComing soon: New Climbs1MerladyV1Bouldering2MermanV2Bouldering