HomeUSASouth DakotaCuster State ParkSylvan LakeSylvan Lake BoulderingNortheast Gully BouldersPerpendicularity BoulderPerpendicularity BoulderLAT,LNG 43.84625, -103.56438CREATED UPDATED Edit MapShareDescription[Edit]About 10 yards off trail to the right, just before the boulder with large seam running up and to the right that sits directly on the trail. Contains two great problems for the area. Rock quality is great and has a clean landing.2 ClimbsComing soon: New Climbs1HypotensionV2Bouldering2HypertensionV4Bouldering