HomeUSACaliforniaInland EmpireRiverside AreaMount RubidouxBorson's AreaCornerstone BoulderCornerstone BoulderLAT,LNG 33.98260, -117.39290CREATED UPDATED Edit MapShareDescription[Edit]No description available. Be the first to contribute!Add description 5 ClimbsComing soon: New Climbs1CornerstonedV-easyBouldering2Cornerstone LefthandV0Bouldering3Cornerstone Left to RightV-easyBouldering4Cornerstone Right to LeftV1Bouldering5Cornerstone RighthandV1+Bouldering