"I don't know if we can write small enough to fit everything people won't know on these maps," he says, eyes sliding over to her finger tracing their rough draft. "There are a few toothbrushes left in the storeroom, there are killer fireflies in a cave, the river goes the wrong way now and by the way, none of us might be real."

And, his personal favorite canyon fact, in relation to this project: "And sometimes the rules are made up and the map doesn't matter, because the forest shifts and loops in on itself. That happened to me a few weeks ago, the river just went on and on."

He eyes their stacks of paper: "Maybe we can fold it up like a pamphlet and write some advice on the back."