Climb up the wall at 490, 326, -129 ish. It's the one that has the scraps and piton/hook looking things at the top of the cliff.
Just so you know, OP .... in order to do what people are telling you, you need to type /waypoint first. For example: /waypoint 490, 326, -129 You must include all three sets of numbers, too. This will result in an orange dot at the point you wish to go.