Charyn Canyon holds one of the most complete rain records on Earth — 80 metres of banded sediment stacked in its walls, read as a near-continuous account of the last five million years. A team led by the Max Planck Institute for Chemistry read those layers in 2021, and they say Central Asia has been drying out steadily since the Pliocene. The canyon itself runs 154 kilometres along the Charyn River and drops as much as 300 metres, cut where snowmelt off the Tian Shan found soft Neogene lake beds sitting on volcanic lava some 330 million years old. The soft rock gave way, the hard rock did not, and that is why its most famous stretch — a side canyon about three kilometres long, its walls around 100 metres high — is called the Valley of Castles: erosion left towers, spires and ramparts standing in rows, like the ruins of a city nobody built.
Nothing on the drive prepares you for it. The steppe runs flat and grassless to the horizon, and then the ground simply opens at your feet. The track down is wide and easy, and the walls change as you descend — ochre and rust at the top, almost black where the old lava shows near the bottom, and there the Charyn runs cold and green between willows. Eagles work the updraughts; the wind never quite stops. It has been a national park since 2004 and is no secret any more: more than 117,000 people came in 2024, most on day trips from Almaty, and a small eco-park with yurts and a shuttle van now waits at the river. Twenty kilometres downstream, in a separate tract of the park, stands the oddest thing here — a relict grove of Sogdian ash, the only one left in Kazakhstan.