"My tribe's cavern is called River-Eating, on the down-flow side of the Shaking Walls. We control from the Wrist-Turned to the Seeping End." More gestures with those names - it's easy to fold one arm in the serpentine shape of the cave, hand above his head, and touch his sharply bent wrist, then cup his hand at his shoulder, to show where the cave ends. A map, or it would be one to another grue.