“The indidges don’t have a name for it. Or half the stuff on this planet.” I pointed at the mountains ahead of us. “Take the Ponypiles. Biggest natural formation on the whole continent, and they don’t have a name for it, or most of the f-and-f. And when they do give stuff names, they don’t make any sense. Their name for the luggage is tssuhlkahttses. It means Dead Soup. And Big Brother won’t let us give things sensible names.”

“Like the Tongue?” he said, grinning.

“It’s long, it’s pink, and it’s hanging out like it’s going ‘aah’ for a doctor. What else would you call it? That’s not its name anyway. The Tongue’s just what we call it. The name on the map’s Conglomerate River, after the rocks it was flowing between up where we named it.”

“An unofficial name,” Ev said, half to himself.

“Won’t work,” I said. “We already named Tight-ass Canyon after C.J. She wants something named after her officially. Passed, approved, and on the topographicals.”

“Oh,” he said, and looked disappointed.

“What about that?” I said. “Any species besides homo sap have to carve a female’s name on a tree to get a jump?”

“No,” he said. “There’s a species of water bird on Choom where the males build plaster dikes around the females that look a lot like the Wall.”

Speaking of which, there it was. The valley had been climbing and opening out as we rode, and all of a sudden we were at the top of a rise and looking out across what looked like one of C.J.’s aerials.

It was flat all the way to the feet of the Ponypiles, with the Tongue slicing through it like a map boundary. Boohte’s got as many oxides as Mars, and lots of cinnabar, so the plains are pink. There were mesas here and there off to the west, and a couple of cinder pyramids, and the blue of the distance turned them a nice lavender. And meandering around them and over the mesas, down to the Tongue and then away again, arched white and shining in the sun, was the Wall. At least Bult hadn’t been lying about the break. The Wall marched unbrokenly as far as I could see.