Yangykala — "fiery fortresses" in Turkmen — is the floor of a vanished sea, lifted into the sky and then cut open. Every band in its walls is sediment that settled underwater when this desert was a seabed, and the sea that laid them down drained away roughly five and a half million years ago; what survives of it is the Caspian, about 160 kilometres west. The colour is the sediment itself: iron-rich beds burn red and orange, softer marl and limestone pale into pink, cream and chalk white, stacked in horizontal stripes that run for kilometres along cliffs 60 to 100 metres high. Turkmen from the region drop the fortress image and call it Gyzyl Dag, the red mountains. There is no gate, no ticket office, no ranger and nothing built here at all — the plateau simply ends, and the canyon opens beneath it.
You arrive by track, not by road. The tarmac gives out at the fork for Gozli Ata, and the rest is unmarked desert driving across ground so flat that the canyon stays invisible until you are standing on its lip, an amphitheatre of striped walls dropping away under your boots. In the last hour of daylight the rock does what the name promises, moving through copper, rose and coral as the shadows stretch. There is no water out here, no shade, no fuel and no phone signal, and the nearest town is hours behind you. Almost everyone now comes with a driver or guide: Turkmenistan grants tourist visas only through a licensed agency, and travel outside Ashgabat must be accompanied, so the canyon still sees very few people. Stay the night and the sky fills with stars, the Milky Way standing over the mesas.